161669838 has 32 divisors (see below), whose sum is σ = 364901760. Its totient is φ = 47300960.

The previous prime is 161669797. The next prime is 161669843. The reversal of 161669838 is 838966161.

161669838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161669838² = 52274273037892488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40320 + ... + 44147.

It is an arithmetic number, because the mean of its divisors is an integer number (11403180).

Almost surely, 2^161669838 is an apocalyptic number.

161669838 is an abundant number, since it is smaller than the sum of its proper divisors (203231922).

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

161669838 is a wasteful number, since it uses less digits than its factorization.

161669838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84512.

The product of its digits is 373248, while the sum is 48.

The square root of 161669838 is about 12714.9454580033. The cubic root of 161669838 is about 544.7655900714.

The spelling of 161669838 in words is "one hundred sixty-one million, six hundred sixty-nine thousand, eight hundred thirty-eight".