16663501625 has 8 divisors (see below), whose sum is σ = 20796050184. Its totient is φ = 13330801200.

The previous prime is 16663501597. The next prime is 16663501639. The reversal of 16663501625 is 52610536661.

It can be written as a sum of positive squares in 4 ways, for example, as 69939769 + 16593561856 = 8363^2 + 128816^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16663501625 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66653882 + ... + 66654131.

It is an arithmetic number, because the mean of its divisors is an integer number (2599506273).

Almost surely, 2^16663501625 is an apocalyptic number.

It is an amenable number.

16663501625 is a deficient number, since it is larger than the sum of its proper divisors (4132548559).

16663501625 is an equidigital number, since it uses as much as digits as its factorization.

16663501625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133308028 (or 133308018 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 16663501625 in words is "sixteen billion, six hundred sixty-three million, five hundred one thousand, six hundred twenty-five".