64297917656 has 32 divisors (see below), whose sum is σ = 142225812480. Its totient is φ = 26667338400.

The previous prime is 64297917653. The next prime is 64297917679. The reversal of 64297917656 is 65671979246.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64297917653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18517250 + ... + 18520721.

It is an arithmetic number, because the mean of its divisors is an integer number (4444556640).

Almost surely, 2^64297917656 is an apocalyptic number.

It is an amenable number.

64297917656 is an abundant number, since it is smaller than the sum of its proper divisors (77927894824).

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

64297917656 is a wasteful number, since it uses less digits than its factorization.

64297917656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37038015 (or 37038011 counting only the distinct ones).

The product of its digits is 34292160, while the sum is 62.

The spelling of 64297917656 in words is "sixty-four billion, two hundred ninety-seven million, nine hundred seventeen thousand, six hundred fifty-six".