215412157188 has 120 divisors (see below), whose sum is σ = 601533552312. Its totient is φ = 66982035456.

The previous prime is 215412157159. The next prime is 215412157199. The reversal of 215412157188 is 881751214512.

215412157188 is a `hidden beast` number, since 2 + 1 + 5 + 412 + 1 + 57 + 188 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46998771264 + 168413385924 = 216792^2 + 410382^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 449356 + ... + 795452.

Almost surely, 2^215412157188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215412157188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300766776156).

215412157188 is an abundant number, since it is smaller than the sum of its proper divisors (386121395124).

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

215412157188 is a wasteful number, since it uses less digits than its factorization.

215412157188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346243 (or 346232 counting only the distinct ones).

The product of its digits is 179200, while the sum is 45.

The spelling of 215412157188 in words is "two hundred fifteen billion, four hundred twelve million, one hundred fifty-seven thousand, one hundred eighty-eight".