215885507812 has 48 divisors (see below), whose sum is σ = 432433106560. Its totient is φ = 93478779648.

The previous prime is 215885507759. The next prime is 215885507861. The reversal of 215885507812 is 218705588512.

It is a happy number.

215885507812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215885507812² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 215885507812.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 958953 + ... + 1162480.

Almost surely, 2^215885507812 is an apocalyptic number.

It is an amenable number.

215885507812 is an abundant number, since it is smaller than the sum of its proper divisors (216547598748).

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

215885507812 is a wasteful number, since it uses less digits than its factorization.

215885507812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121572 (or 2121570 counting only the distinct ones).

The product of its (nonzero) digits is 1792000, while the sum is 52.

The spelling of 215885507812 in words is "two hundred fifteen billion, eight hundred eighty-five million, five hundred seven thousand, eight hundred twelve".