64641416664 has 96 divisors (see below), whose sum is σ = 177934624560. Its totient is φ = 19554754560.

The previous prime is 64641416627. The next prime is 64641416669. The reversal of 64641416664 is 46661414646.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64641416669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1703304 + ... + 1740840.

Almost surely, 2^64641416664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64641416664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88967312280).

64641416664 is an abundant number, since it is smaller than the sum of its proper divisors (113293207896).

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

64641416664 is a wasteful number, since it uses less digits than its factorization.

64641416664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38161 (or 38146 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 48.

The spelling of 64641416664 in words is "sixty-four billion, six hundred forty-one million, four hundred sixteen thousand, six hundred sixty-four".