16640662464 has 56 divisors (see below), whose sum is σ = 48920471120. Its totient is φ = 5546886912.

The previous prime is 16640662459. The next prime is 16640662469. The reversal of 16640662464 is 46426604661.

16640662464 is a `hidden beast` number, since 16 + 6 + 4 + 0 + 6 + 624 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (16640662459) and next prime (16640662469).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640662469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4813279 + ... + 4816734.

Almost surely, 2^16640662464 is an apocalyptic number.

It is an amenable number.

16640662464 is an abundant number, since it is smaller than the sum of its proper divisors (32279808656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16640662464 is an equidigital number, since it uses as much as digits as its factorization.

16640662464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9630034 (or 9630018 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 45.

The spelling of 16640662464 in words is "sixteen billion, six hundred forty million, six hundred sixty-two thousand, four hundred sixty-four".