157644907218 has 24 divisors (see below), whose sum is σ = 342729724428. Its totient is φ = 52368954912.

The previous prime is 157644907193. The next prime is 157644907237. The reversal of 157644907218 is 812709446751.

157644907218 is a `hidden beast` number, since 1 + 5 + 76 + 4 + 490 + 72 + 18 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 139500009009 + 18144898209 = 373497^2 + 134703^2 .

It is a super-3 number, since 3×157644907218³ (a number of 35 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14940205 + ... + 14950752.

Almost surely, 2^157644907218 is an apocalyptic number.

157644907218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

157644907218 is an abundant number, since it is smaller than the sum of its proper divisors (185084817210).

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

157644907218 is a wasteful number, since it uses less digits than its factorization.

157644907218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29891258 (or 29891255 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 157644907218 in words is "one hundred fifty-seven billion, six hundred forty-four million, nine hundred seven thousand, two hundred eighteen".