660626513420560 has 80 divisors (see below), whose sum is σ = 1561383231773760. Its totient is φ = 259877509240320.

The previous prime is 660626513420557. The next prime is 660626513420563. The reversal of 660626513420560 is 65024315626066.

It is an interprime number because it is at equal distance from previous prime (660626513420557) and next prime (660626513420563).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×660626513420560³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660626513420498 and 660626513420507.

It is not an unprimeable number, because it can be changed into a prime (660626513420563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20151331 + ... + 41561149.

It is an arithmetic number, because the mean of its divisors is an integer number (19517290397172).

Almost surely, 2^{660626513420560} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660626513420560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780691615886880).

660626513420560 is an abundant number, since it is smaller than the sum of its proper divisors (900756718353200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660626513420560 is a wasteful number, since it uses less digits than its factorization.

660626513420560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21416216 (or 21416210 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 660626513420560 in words is "six hundred sixty trillion, six hundred twenty-six billion, five hundred thirteen million, four hundred twenty thousand, five hundred sixty".