161726625 has 40 divisors (see below), whose sum is σ = 301525224. Its totient is φ = 86248800.

The previous prime is 161726623. The next prime is 161726629. The reversal of 161726625 is 526627161.

It is a happy number.

161726625 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 26 + 625 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1147041 + 160579584 = 1071^2 + 12672^2 .

It is not a de Polignac number, because 161726625 - 2¹ = 161726623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161726625.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161726623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2139 + ... + 18111.

Almost surely, 2^161726625 is an apocalyptic number.

161726625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161726625 is a deficient number, since it is larger than the sum of its proper divisors (139798599).

161726625 is an equidigital number, since it uses as much as digits as its factorization.

161726625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000 (or 15981 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 161726625 is about 12717.1783426985. The cubic root of 161726625 is about 544.8293661032.

The spelling of 161726625 in words is "one hundred sixty-one million, seven hundred twenty-six thousand, six hundred twenty-five".