161257688224 has 24 divisors (see below), whose sum is σ = 317557371348. Its totient is φ = 80608197120.

The previous prime is 161257688213. The next prime is 161257688243. The reversal of 161257688224 is 422886752161.

It can be written as a sum of positive squares in 2 ways, for example, as 158190743824 + 3066944400 = 397732^2 + 55380^2 .

It is a super-2 number, since 2×161257688224² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517917 + ... + 768604.

Almost surely, 2^161257688224 is an apocalyptic number.

It is an amenable number.

161257688224 is a deficient number, since it is larger than the sum of its proper divisors (156299683124).

161257688224 is a wasteful number, since it uses less digits than its factorization.

161257688224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290448 (or 1290440 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 52.

The spelling of 161257688224 in words is "one hundred sixty-one billion, two hundred fifty-seven million, six hundred eighty-eight thousand, two hundred twenty-four".