16625649 has 12 divisors (see below), whose sum is σ = 22746416. Its totient is φ = 10795848.

The previous prime is 16625597. The next prime is 16625663. The reversal of 16625649 is 94652661.

It is not a de Polignac number, because 16625649 - 2¹⁹ = 16101361 is a prime.

It is a Duffinian number.

Its product of digits (77760) is a multiple of the sum of its prime divisors (405).

It is not an unprimeable number, because it can be changed into a prime (16625689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46132 + ... + 46490.

Almost surely, 2^16625649 is an apocalyptic number.

It is an amenable number.

16625649 is a deficient number, since it is larger than the sum of its proper divisors (6120767).

16625649 is an frugal number, since it uses more digits than its factorization.

16625649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 405 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 16625649 is about 4077.4561922846. The cubic root of 16625649 is about 255.2267571598.

The spelling of 16625649 in words is "sixteen million, six hundred twenty-five thousand, six hundred forty-nine".