161668356 has 12 divisors (see below), whose sum is σ = 377226192. Its totient is φ = 53889448.

The previous prime is 161668291. The next prime is 161668369. The reversal of 161668356 is 653866161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×161668356² = 52273314663485472, which 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, 6736170 + ... + 6736193.

It is an arithmetic number, because the mean of its divisors is an integer number (31435516).

Almost surely, 2^161668356 is an apocalyptic number.

It is an amenable number.

161668356 is an abundant number, since it is smaller than the sum of its proper divisors (215557836).

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

161668356 is a wasteful number, since it uses less digits than its factorization.

161668356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13472370 (or 13472368 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 161668356 is about 12714.8871799950. The cubic root of 161668356 is about 544.7639254750.

The spelling of 161668356 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, three hundred fifty-six".