16636625 has 16 divisors (see below), whose sum is σ = 21986640. Its totient is φ = 12524800.

The previous prime is 16636583. The next prime is 16636639. The reversal of 16636625 is 52663661.

It can be written as a sum of positive squares in 8 ways, for example, as 6345361 + 10291264 = 2519^2 + 3208^2 .

It is not a de Polignac number, because 16636625 - 2⁸ = 16636369 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1790 + ... + 6039.

It is an arithmetic number, because the mean of its divisors is an integer number (1374165).

Almost surely, 2^16636625 is an apocalyptic number.

It is an amenable number.

16636625 is a deficient number, since it is larger than the sum of its proper divisors (5350015).

16636625 is an equidigital number, since it uses as much as digits as its factorization.

16636625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861 (or 7851 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 16636625 is about 4078.8019074233. The cubic root of 16636625 is about 255.2829104091.

The spelling of 16636625 in words is "sixteen million, six hundred thirty-six thousand, six hundred twenty-five".