64521534572516 has 36 divisors (see below), whose sum is σ = 134402000605488. Its totient is φ = 27009014468688.

The previous prime is 64521534572513. The next prime is 64521534572533. The reversal of 64521534572516 is 61527543512546.

It is not an unprimeable number, because it can be changed into a prime (64521534572513) 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, 3827799746 + ... + 3827816601.

It is an arithmetic number, because the mean of its divisors is an integer number (3733388905708).

Almost surely, 2^{64521534572516} is an apocalyptic number.

It is an amenable number.

64521534572516 is an abundant number, since it is smaller than the sum of its proper divisors (69880466032972).

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

64521534572516 is a wasteful number, since it uses less digits than its factorization.

64521534572516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7655616408 (or 7655616399 counting only the distinct ones).

The product of its digits is 30240000, while the sum is 56.

The spelling of 64521534572516 in words is "sixty-four trillion, five hundred twenty-one billion, five hundred thirty-four million, five hundred seventy-two thousand, five hundred sixteen".