161505320 has 32 divisors (see below), whose sum is σ = 382514400. Its totient is φ = 61201728.

The previous prime is 161505317. The next prime is 161505341. The reversal of 161505320 is 23505161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105494 + ... + 107013.

It is an arithmetic number, because the mean of its divisors is an integer number (11953575).

Almost surely, 2^161505320 is an apocalyptic number.

161505320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161505320 is an abundant number, since it is smaller than the sum of its proper divisors (221009080).

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

161505320 is a wasteful number, since it uses less digits than its factorization.

161505320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212537 (or 212533 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 161505320 is about 12708.4743380156. The cubic root of 161505320 is about 544.5807397523.

The spelling of 161505320 in words is "one hundred sixty-one million, five hundred five thousand, three hundred twenty".