161640356 has 12 divisors (see below), whose sum is σ = 283235568. Its totient is φ = 80715912.

The previous prime is 161640341. The next prime is 161640361. The reversal of 161640356 is 653046161.

161640356 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 2×161640356² = 52255209375613472, 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, 22526 + ... + 28821.

It is an arithmetic number, because the mean of its divisors is an integer number (23602964).

Almost surely, 2^161640356 is an apocalyptic number.

It is an amenable number.

161640356 is a deficient number, since it is larger than the sum of its proper divisors (121595212).

161640356 is a wasteful number, since it uses less digits than its factorization.

161640356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52138 (or 52136 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 161640356 is about 12713.7860608082. The cubic root of 161640356 is about 544.7324736994.

The spelling of 161640356 in words is "one hundred sixty-one million, six hundred forty thousand, three hundred fifty-six".