16919718623 has 2 divisors, whose sum is σ = 16919718624. Its totient is φ = 16919718622.

The previous prime is 16919718601. The next prime is 16919718631. The reversal of 16919718623 is 32681791961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16919718623 - 2²⁸ = 16651283167 is a prime.

It is a super-2 number, since 2×16919718623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16919718523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8459859311 + 8459859312.

It is an arithmetic number, because the mean of its divisors is an integer number (8459859312).

Almost surely, 2^16919718623 is an apocalyptic number.

16919718623 is a deficient number, since it is larger than the sum of its proper divisors (1).

16919718623 is an equidigital number, since it uses as much as digits as its factorization.

16919718623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The spelling of 16919718623 in words is "sixteen billion, nine hundred nineteen million, seven hundred eighteen thousand, six hundred twenty-three".