161397568 has 28 divisors (see below), whose sum is σ = 325709280. Its totient is φ = 79329152.

The previous prime is 161397559. The next prime is 161397581. The reversal of 161397568 is 865793161.

It is a happy number.

161397568 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 17596 + ... + 25147.

Almost surely, 2^161397568 is an apocalyptic number.

It is an amenable number.

161397568 is an abundant number, since it is smaller than the sum of its proper divisors (164311712).

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

161397568 is an equidigital number, since it uses as much as digits as its factorization.

161397568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42814 (or 42804 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 161397568 is about 12704.2342547672. The cubic root of 161397568 is about 544.4596029407.

The spelling of 161397568 in words is "one hundred sixty-one million, three hundred ninety-seven thousand, five hundred sixty-eight".