215565853900 has 18 divisors (see below), whose sum is σ = 467777903180. Its totient is φ = 86226341520.

The previous prime is 215565853879. The next prime is 215565853973. The reversal of 215565853900 is 9358565512.

It is a super-2 number, since 2×215565853900² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1077829170 + ... + 1077829369.

Almost surely, 2^215565853900 is an apocalyptic number.

215565853900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215565853900 is an abundant number, since it is smaller than the sum of its proper divisors (252212049280).

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

215565853900 is a wasteful number, since it uses less digits than its factorization.

215565853900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155658553 (or 2155658546 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 215565853900 in words is "two hundred fifteen billion, five hundred sixty-five million, eight hundred fifty-three thousand, nine hundred".