16919998678 has 16 divisors (see below), whose sum is σ = 27691151760. Its totient is φ = 7689830400.

The previous prime is 16919998643. The next prime is 16919998709. The reversal of 16919998678 is 87689991961.

It is a self number, because there is not a number n which added to its sum of digits gives 16919998678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118918 + ... + 219046.

It is an arithmetic number, because the mean of its divisors is an integer number (1730696985).

Almost surely, 2^16919998678 is an apocalyptic number.

16919998678 is a deficient number, since it is larger than the sum of its proper divisors (10771153082).

16919998678 is a wasteful number, since it uses less digits than its factorization.

16919998678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107823.

The product of its digits is 105815808, while the sum is 73.

The spelling of 16919998678 in words is "sixteen billion, nine hundred nineteen million, nine hundred ninety-eight thousand, six hundred seventy-eight".