161664155236 has 12 divisors (see below), whose sum is σ = 282924238828. Its totient is φ = 80828658432.

The previous prime is 161664155227. The next prime is 161664155249. The reversal of 161664155236 is 632551466161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62672118336 + 98992036900 = 250344^2 + 314630^2 .

It is a super-2 number, since 2×161664155236² (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, 746901 + ... + 938716.

Almost surely, 2^161664155236 is an apocalyptic number.

It is an amenable number.

161664155236 is a deficient number, since it is larger than the sum of its proper divisors (121260083592).

161664155236 is a wasteful number, since it uses less digits than its factorization.

161664155236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709598 (or 1709596 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

The spelling of 161664155236 in words is "one hundred sixty-one billion, six hundred sixty-four million, one hundred fifty-five thousand, two hundred thirty-six".