16640464664 has 8 divisors (see below), whose sum is σ = 31200871260. Its totient is φ = 8320232328.

The previous prime is 16640464663. The next prime is 16640464669. The reversal of 16640464664 is 46646404661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640464663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040029034 + ... + 1040029049.

Almost surely, 2^16640464664 is an apocalyptic number.

It is an amenable number.

16640464664 is a deficient number, since it is larger than the sum of its proper divisors (14560406596).

16640464664 is a wasteful number, since it uses less digits than its factorization.

16640464664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080058089 (or 2080058085 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 47.

The spelling of 16640464664 in words is "sixteen billion, six hundred forty million, four hundred sixty-four thousand, six hundred sixty-four".