215155634490 has 48 divisors (see below), whose sum is σ = 578694472200. Its totient is φ = 55396392576.

The previous prime is 215155634437. The next prime is 215155634527. The reversal of 215155634490 is 94436551512.

It is a happy number.

215155634490 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 5 + 5 + 634 + 4 + 9 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 159634608849 + 55521025641 = 399543^2 + 235629^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41214945 + ... + 41220164.

Almost surely, 2^215155634490 is an apocalyptic number.

215155634490 is an abundant number, since it is smaller than the sum of its proper divisors (363538837710).

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

215155634490 is a wasteful number, since it uses less digits than its factorization.

215155634490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82435151 (or 82435148 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 215155634490 in words is "two hundred fifteen billion, one hundred fifty-five million, six hundred thirty-four thousand, four hundred ninety".