161578660 has 24 divisors (see below), whose sum is σ = 357174720. Its totient is φ = 61229664.

The previous prime is 161578619. The next prime is 161578661. The reversal of 161578660 is 66875161.

161578660 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 2×161578660² = 52215326734791200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161578661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212224 + ... + 212983.

It is an arithmetic number, because the mean of its divisors is an integer number (14882280).

Almost surely, 2^161578660 is an apocalyptic number.

161578660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161578660 is an abundant number, since it is smaller than the sum of its proper divisors (195596060).

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

161578660 is a wasteful number, since it uses less digits than its factorization.

161578660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425235 (or 425233 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 161578660 is about 12711.3594866954. The cubic root of 161578660 is about 544.6631591373.

The spelling of 161578660 in words is "one hundred sixty-one million, five hundred seventy-eight thousand, six hundred sixty".