64615120520 has 32 divisors (see below), whose sum is σ = 147431689920. Its totient is φ = 25482018240.

The previous prime is 64615120519. The next prime is 64615120529. The reversal of 64615120520 is 2502151646.

It is a super-2 number, since 2×64615120520² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64615120529) 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 7 ways as a sum of consecutive naturals, for example, 11373062 + ... + 11378741.

It is an arithmetic number, because the mean of its divisors is an integer number (4607240310).

Almost surely, 2^64615120520 is an apocalyptic number.

It is an amenable number.

64615120520 is an abundant number, since it is smaller than the sum of its proper divisors (82816569400).

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

64615120520 is a wasteful number, since it uses less digits than its factorization.

64615120520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22751885 (or 22751881 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 64615120520 in words is "sixty-four billion, six hundred fifteen million, one hundred twenty thousand, five hundred twenty".