663740515620 has 384 divisors, whose sum is σ = 2579447808000. Its totient is φ = 137951092224.

The previous prime is 663740515577. The next prime is 663740515639. The reversal of 663740515620 is 26515047366.

663740515620 is a `hidden beast` number, since 6 + 6 + 3 + 7 + 4 + 0 + 5 + 15 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3191581 + ... + 3393179.

It is an arithmetic number, because the mean of its divisors is an integer number (6717312000).

Almost surely, 2^663740515620 is an apocalyptic number.

663740515620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663740515620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1289723904000).

663740515620 is an abundant number, since it is smaller than the sum of its proper divisors (1915707292380).

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

663740515620 is a wasteful number, since it uses less digits than its factorization.

663740515620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201704 (or 201696 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 663740515620 in words is "six hundred sixty-three billion, seven hundred forty million, five hundred fifteen thousand, six hundred twenty".