2656994640 has 80 divisors (see below), whose sum is σ = 8244972288. Its totient is φ = 707819008.

The previous prime is 2656994621. The next prime is 2656994663. The reversal of 2656994640 is 464996562.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259702 + ... + 269738.

Almost surely, 2^2656994640 is an apocalyptic number.

2656994640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656994640 is an abundant number, since it is smaller than the sum of its proper divisors (5587977648).

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

2656994640 is a wasteful number, since it uses less digits than its factorization.

2656994640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11156 (or 11150 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The square root of 2656994640 is about 51546.0438831148. The cubic root of 2656994640 is about 1385.0439654661.

The spelling of 2656994640 in words is "two billion, six hundred fifty-six million, nine hundred ninety-four thousand, six hundred forty".