161397580 has 12 divisors (see below), whose sum is σ = 338934960. Its totient is φ = 64559024.

The previous prime is 161397559. The next prime is 161397581. The reversal of 161397580 is 85793161.

161397580 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161397581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4034920 + ... + 4034959.

It is an arithmetic number, because the mean of its divisors is an integer number (28244580).

Almost surely, 2^161397580 is an apocalyptic number.

161397580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161397580 is an abundant number, since it is smaller than the sum of its proper divisors (177537380).

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

161397580 is a wasteful number, since it uses less digits than its factorization.

161397580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8069888 (or 8069886 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 161397580 is about 12704.2347270507. The cubic root of 161397580 is about 544.4596164344.

The spelling of 161397580 in words is "one hundred sixty-one million, three hundred ninety-seven thousand, five hundred eighty".