215257335680 has 64 divisors (see below), whose sum is σ = 514770886800. Its totient is φ = 86074269696.

The previous prime is 215257335653. The next prime is 215257335703. The reversal of 215257335680 is 86533752512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922519 + ... + 2031401.

Almost surely, 2^215257335680 is an apocalyptic number.

215257335680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215257335680 is an abundant number, since it is smaller than the sum of its proper divisors (299513551120).

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

215257335680 is a wasteful number, since it uses less digits than its factorization.

215257335680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111991 (or 111979 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 215257335680 in words is "two hundred fifteen billion, two hundred fifty-seven million, three hundred thirty-five thousand, six hundred eighty".