516438685931 has 24 divisors (see below), whose sum is σ = 609908829984. Its totient is φ = 435935364480.

The previous prime is 516438685879. The next prime is 516438685937. The reversal of 516438685931 is 139586834615.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-516438685931 is a prime.

It is a super-2 number, since 2×516438685931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516438685937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2255186 + ... + 2473608.

It is an arithmetic number, because the mean of its divisors is an integer number (25412867916).

Almost surely, 2^516438685931 is an apocalyptic number.

516438685931 is a deficient number, since it is larger than the sum of its proper divisors (93470144053).

516438685931 is a wasteful number, since it uses less digits than its factorization.

516438685931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219171 (or 219164 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 59.

The spelling of 516438685931 in words is "five hundred sixteen billion, four hundred thirty-eight million, six hundred eighty-five thousand, nine hundred thirty-one".