161579925 has 72 divisors (see below), whose sum is σ = 320307624. Its totient is φ = 77345280.

The previous prime is 161579863. The next prime is 161579959. The reversal of 161579925 is 529975161.

161579925 is a `hidden beast` number, since 1 + 615 + 7 + 9 + 9 + 25 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 13373649 + 148206276 = 3657^2 + 12174^2 .

It is not a de Polignac number, because 161579925 - 2⁶ = 161579861 is a prime.

It is a super-2 number, since 2×161579925² = 52216144326011250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 107479 + ... + 108971.

It is an arithmetic number, because the mean of its divisors is an integer number (4448717).

Almost surely, 2^161579925 is an apocalyptic number.

161579925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161579925 is a deficient number, since it is larger than the sum of its proper divisors (158727699).

161579925 is a wasteful number, since it uses less digits than its factorization.

161579925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559 (or 1551 counting only the distinct ones).

The product of its digits is 170100, while the sum is 45.

The square root of 161579925 is about 12711.4092452411. The cubic root of 161579925 is about 544.6645805236.

The spelling of 161579925 in words is "one hundred sixty-one million, five hundred seventy-nine thousand, nine hundred twenty-five".