16644036758463 has 8 divisors (see below), whose sum is σ = 24657832234800. Its totient is φ = 11096024505624.

The previous prime is 16644036758449. The next prime is 16644036758533. The reversal of 16644036758463 is 36485763044661.

16644036758463 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 40 + 3 + 6 + 7 + 584 + 6 + 3 = 666.

It is not a de Polignac number, because 16644036758463 - 2⁵ = 16644036758431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16644036758463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644036758563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308222902908 + ... + 308222902961.

It is an arithmetic number, because the mean of its divisors is an integer number (3082229029350).

Almost surely, 2^{16644036758463} is an apocalyptic number.

16644036758463 is a deficient number, since it is larger than the sum of its proper divisors (8013795476337).

16644036758463 is an equidigital number, since it uses as much as digits as its factorization.

16644036758463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616445805878 (or 616445805872 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 63.

The spelling of 16644036758463 in words is "sixteen trillion, six hundred forty-four billion, thirty-six million, seven hundred fifty-eight thousand, four hundred sixty-three".