2646387664 has 20 divisors (see below), whose sum is σ = 5292776320. Its totient is φ = 1280509920.

The previous prime is 2646387647. The next prime is 2646387673. The reversal of 2646387664 is 4667836462.

It is a happy number.

2646387664 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667234 + ... + 2668225.

It is an arithmetic number, because the mean of its divisors is an integer number (264638816).

Almost surely, 2^2646387664 is an apocalyptic number.

It is an amenable number.

2646387664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2646387664 is a wasteful number, since it uses less digits than its factorization.

2646387664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335498 (or 5335492 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 52.

The square root of 2646387664 is about 51443.0526310405. The cubic root of 2646387664 is about 1383.1984315668.

The spelling of 2646387664 in words is "two billion, six hundred forty-six million, three hundred eighty-seven thousand, six hundred sixty-four".