66765826080 has 72 divisors (see below), whose sum is σ = 227838386412. Its totient is φ = 17804219904.

The previous prime is 66765826073. The next prime is 66765826087. The reversal of 66765826080 is 8062856766.

It is an interprime number because it is at equal distance from previous prime (66765826073) and next prime (66765826087).

It can be written as a sum of positive squares in 2 ways, for example, as 61923336336 + 4842489744 = 248844^2 + 69588^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (66765826087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23181139 + ... + 23184018.

Almost surely, 2^66765826080 is an apocalyptic number.

66765826080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66765826080 is an abundant number, since it is smaller than the sum of its proper divisors (161072560332).

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

66765826080 is a wasteful number, since it uses less digits than its factorization.

66765826080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46365178 (or 46365167 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 66765826080 in words is "sixty-six billion, seven hundred sixty-five million, eight hundred twenty-six thousand, eighty".