215470257856 has 28 divisors (see below), whose sum is σ = 488655764368. Its totient is φ = 92344396032.

The previous prime is 215470257829. The next prime is 215470257857. The reversal of 215470257856 is 658752074512.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×215470257856² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215470257857) 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, 240479751 + ... + 240480646.

Almost surely, 2^215470257856 is an apocalyptic number.

It is an amenable number.

215470257856 is an abundant number, since it is smaller than the sum of its proper divisors (273185506512).

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

215470257856 is an equidigital number, since it uses as much as digits as its factorization.

215470257856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480960416 (or 480960406 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 52.

The spelling of 215470257856 in words is "two hundred fifteen billion, four hundred seventy million, two hundred fifty-seven thousand, eight hundred fifty-six".