161327725 has 24 divisors (see below), whose sum is σ = 222876360. Its totient is φ = 115019520.

The previous prime is 161327713. The next prime is 161327731. The reversal of 161327725 is 527723161.

It can be written as a sum of positive squares in 12 ways, for example, as 127373796 + 33953929 = 11286^2 + 5827^2 .

It is not a de Polignac number, because 161327725 - 2⁹ = 161327213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 867 + ... + 17983.

It is an arithmetic number, because the mean of its divisors is an integer number (9286515).

Almost surely, 2^161327725 is an apocalyptic number.

It is an amenable number.

161327725 is a deficient number, since it is larger than the sum of its proper divisors (61548635).

161327725 is a wasteful number, since it uses less digits than its factorization.

161327725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17169 (or 17164 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 161327725 is about 12701.4851493831. The cubic root of 161327725 is about 544.3810553330.

The spelling of 161327725 in words is "one hundred sixty-one million, three hundred twenty-seven thousand, seven hundred twenty-five".