215961387675 has 48 divisors (see below), whose sum is σ = 410016673920. Its totient is φ = 99197568000.

The previous prime is 215961387659. The next prime is 215961387701. The reversal of 215961387675 is 576783169512.

It is not a de Polignac number, because 215961387675 - 2⁴ = 215961387659 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6873046 + ... + 6904395.

It is an arithmetic number, because the mean of its divisors is an integer number (8542014040).

Almost surely, 2^215961387675 is an apocalyptic number.

215961387675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215961387675 is a deficient number, since it is larger than the sum of its proper divisors (194055286245).

215961387675 is a wasteful number, since it uses less digits than its factorization.

215961387675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13777484 (or 13777479 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 60.

The spelling of 215961387675 in words is "two hundred fifteen billion, nine hundred sixty-one million, three hundred eighty-seven thousand, six hundred seventy-five".