2638553656 has 16 divisors (see below), whose sum is σ = 4948757640. Its totient is φ = 1318884960.

The previous prime is 2638553641. The next prime is 2638553681. The reversal of 2638553656 is 6563558362.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19311 + ... + 75166.

Almost surely, 2^2638553656 is an apocalyptic number.

It is an amenable number.

2638553656 is a deficient number, since it is larger than the sum of its proper divisors (2310203984).

2638553656 is a wasteful number, since it uses less digits than its factorization.

2638553656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97974 (or 97970 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 49.

The square root of 2638553656 is about 51366.8536704362. The cubic root of 2638553656 is about 1381.8322047148.

The spelling of 2638553656 in words is "two billion, six hundred thirty-eight million, five hundred fifty-three thousand, six hundred fifty-six".