64157256537 has 8 divisors (see below), whose sum is σ = 93319645920. Its totient is φ = 38883185760.

The previous prime is 64157256533. The next prime is 64157256557. The reversal of 64157256537 is 73565275146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64157256537 - 2² = 64157256533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64157256537.

It is not an unprimeable number, because it can be changed into a prime (64157256533) 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, 972079612 + ... + 972079677.

It is an arithmetic number, because the mean of its divisors is an integer number (11664955740).

Almost surely, 2^64157256537 is an apocalyptic number.

It is an amenable number.

64157256537 is a deficient number, since it is larger than the sum of its proper divisors (29162389383).

64157256537 is a wasteful number, since it uses less digits than its factorization.

64157256537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944159303.

The product of its digits is 5292000, while the sum is 51.

The spelling of 64157256537 in words is "sixty-four billion, one hundred fifty-seven million, two hundred fifty-six thousand, five hundred thirty-seven".