161646625 has 32 divisors (see below), whose sum is σ = 244138752. Its totient is φ = 104313600.

The previous prime is 161646593. The next prime is 161646629. The reversal of 161646625 is 526646161.

It is not a de Polignac number, because 161646625 - 2⁵ = 161646593 is a prime.

It is a super-2 number, since 2×161646625² = 52259262747781250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161646629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9442 + ... + 20308.

It is an arithmetic number, because the mean of its divisors is an integer number (7629336).

Almost surely, 2^161646625 is an apocalyptic number.

It is an amenable number.

161646625 is a deficient number, since it is larger than the sum of its proper divisors (82492127).

161646625 is a wasteful number, since it uses less digits than its factorization.

161646625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906 (or 10896 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 161646625 is about 12714.0326018144. The cubic root of 161646625 is about 544.7395158428.

The spelling of 161646625 in words is "one hundred sixty-one million, six hundred forty-six thousand, six hundred twenty-five".