16656635125 has 16 divisors (see below), whose sum is σ = 22386519792. Its totient is φ = 12300283200.

The previous prime is 16656635081. The next prime is 16656635131. The reversal of 16656635125 is 52153665661.

It can be written as a sum of positive squares in 8 ways, for example, as 10232131716 + 6424503409 = 101154^2 + 80153^2 .

It is not a de Polignac number, because 16656635125 - 2²¹ = 16654537973 is a prime.

It is a congruent number.

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, 5123494 + ... + 5126743.

It is an arithmetic number, because the mean of its divisors is an integer number (1399157487).

Almost surely, 2^16656635125 is an apocalyptic number.

It is an amenable number.

16656635125 is a deficient number, since it is larger than the sum of its proper divisors (5729884667).

16656635125 is a wasteful number, since it uses less digits than its factorization.

16656635125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250265 (or 10250255 counting only the distinct ones).

The product of its digits is 972000, while the sum is 46.

The spelling of 16656635125 in words is "sixteen billion, six hundred fifty-six million, six hundred thirty-five thousand, one hundred twenty-five".