64137857831 has 4 divisors (see below), whose sum is σ = 65502493152. Its totient is φ = 62773222512.

The previous prime is 64137857789. The next prime is 64137857857. The reversal of 64137857831 is 13875873146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13875873146 = 2 ⋅6937936573.

It is a cyclic number.

It is not a de Polignac number, because 64137857831 - 2²² = 64133663527 is a prime.

It is a super-2 number, since 2×64137857831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64137157831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682317590 + ... + 682317683.

It is an arithmetic number, because the mean of its divisors is an integer number (16375623288).

Almost surely, 2^64137857831 is an apocalyptic number.

64137857831 is a deficient number, since it is larger than the sum of its proper divisors (1364635321).

64137857831 is a wasteful number, since it uses less digits than its factorization.

64137857831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364635320.

The product of its digits is 3386880, while the sum is 53.

The spelling of 64137857831 in words is "sixty-four billion, one hundred thirty-seven million, eight hundred fifty-seven thousand, eight hundred thirty-one".