64563256523 has 16 divisors (see below), whose sum is σ = 71702527104. Its totient is φ = 57865144320.

The previous prime is 64563256519. The next prime is 64563256531. The reversal of 64563256523 is 32565236546.

It is a cyclic number.

It is not a de Polignac number, because 64563256523 - 2² = 64563256519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (64563246523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1062398 + ... + 1121523.

It is an arithmetic number, because the mean of its divisors is an integer number (4481407944).

Almost surely, 2^64563256523 is an apocalyptic number.

64563256523 is a deficient number, since it is larger than the sum of its proper divisors (7139270581).

64563256523 is a wasteful number, since it uses less digits than its factorization.

64563256523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184022.

The product of its digits is 3888000, while the sum is 47.

The spelling of 64563256523 in words is "sixty-four billion, five hundred sixty-three million, two hundred fifty-six thousand, five hundred twenty-three".