215634136872 has 128 divisors (see below), whose sum is σ = 688499481600. Its totient is φ = 54642777600.

The previous prime is 215634136811. The next prime is 215634136877. The reversal of 215634136872 is 278631436512.

215634136872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (215634136877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1347222 + ... + 1498757.

It is an arithmetic number, because the mean of its divisors is an integer number (5378902200).

Almost surely, 2^215634136872 is an apocalyptic number.

215634136872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

215634136872 is an abundant number, since it is smaller than the sum of its proper divisors (472865344728).

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

215634136872 is a wasteful number, since it uses less digits than its factorization.

215634136872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846047 (or 2846043 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 48.

The spelling of 215634136872 in words is "two hundred fifteen billion, six hundred thirty-four million, one hundred thirty-six thousand, eight hundred seventy-two".