16688964664 has 8 divisors (see below), whose sum is σ = 31291808760. Its totient is φ = 8344482328.

The previous prime is 16688964661. The next prime is 16688964671. The reversal of 16688964664 is 46646988661.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 16688964596 and 16688964605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688964661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043060284 + ... + 1043060299.

It is an arithmetic number, because the mean of its divisors is an integer number (3911476095).

Almost surely, 2^16688964664 is an apocalyptic number.

It is an amenable number.

16688964664 is a deficient number, since it is larger than the sum of its proper divisors (14602844096).

16688964664 is a wasteful number, since it uses less digits than its factorization.

16688964664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086120589 (or 2086120585 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 64.

The spelling of 16688964664 in words is "sixteen billion, six hundred eighty-eight million, nine hundred sixty-four thousand, six hundred sixty-four".