16861604678 has 16 divisors (see below), whose sum is σ = 25661958576. Its totient is φ = 8307826560.

The previous prime is 16861604657. The next prime is 16861604687. The reversal of 16861604678 is 87640616861.

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 7 ways as a sum of consecutive naturals, for example, 112538 + ... + 215378.

It is an arithmetic number, because the mean of its divisors is an integer number (1603872411).

Almost surely, 2^16861604678 is an apocalyptic number.

16861604678 is a deficient number, since it is larger than the sum of its proper divisors (8800353898).

16861604678 is a wasteful number, since it uses less digits than its factorization.

16861604678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104039.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 16861604678 in words is "sixteen billion, eight hundred sixty-one million, six hundred four thousand, six hundred seventy-eight".