16656514639 has 2 divisors, whose sum is σ = 16656514640. Its totient is φ = 16656514638.

The previous prime is 16656514631. The next prime is 16656514669. The reversal of 16656514639 is 93641565661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16656514639 - 2³ = 16656514631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16656514631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328257319 + 8328257320.

It is an arithmetic number, because the mean of its divisors is an integer number (8328257320).

Almost surely, 2^16656514639 is an apocalyptic number.

16656514639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656514639 is an equidigital number, since it uses as much as digits as its factorization.

16656514639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 52.

The spelling of 16656514639 in words is "sixteen billion, six hundred fifty-six million, five hundred fourteen thousand, six hundred thirty-nine".