16451664975 has 144 divisors (see below), whose sum is σ = 31492651008. Its totient is φ = 8509587840.

The previous prime is 16451664953. The next prime is 16451665039. The reversal of 16451664975 is 57946615461.

16451664975 is a `hidden beast` number, since 1 + 64 + 516 + 64 + 9 + 7 + 5 = 666.

It is not a de Polignac number, because 16451664975 - 2²² = 16447470671 is a prime.

It is a congruent 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 143 ways as a sum of consecutive naturals, for example, 44827242 + ... + 44827608.

Almost surely, 2^16451664975 is an apocalyptic number.

16451664975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16451664975 is a deficient number, since it is larger than the sum of its proper divisors (15040986033).

16451664975 is a wasteful number, since it uses less digits than its factorization.

16451664975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 579 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 16451664975 in words is "sixteen billion, four hundred fifty-one million, six hundred sixty-four thousand, nine hundred seventy-five".