215565481900 has 18 divisors (see below), whose sum is σ = 467777095940. Its totient is φ = 86226192720.

The previous prime is 215565481889. The next prime is 215565481909. The reversal of 215565481900 is 9184565512.

It is a super-2 number, since 2×215565481900² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215565481909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1077827310 + ... + 1077827509.

Almost surely, 2^215565481900 is an apocalyptic number.

215565481900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215565481900 is an abundant number, since it is smaller than the sum of its proper divisors (252211614040).

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

215565481900 is a wasteful number, since it uses less digits than its factorization.

215565481900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155654833 (or 2155654826 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 215565481900 in words is "two hundred fifteen billion, five hundred sixty-five million, four hundred eighty-one thousand, nine hundred".