2656662638 has 16 divisors (see below), whose sum is σ = 4605452640. Its totient is φ = 1125776256.

The previous prime is 2656662611. The next prime is 2656662643. The reversal of 2656662638 is 8362666562.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064831 + ... + 1067322.

It is an arithmetic number, because the mean of its divisors is an integer number (287840790).

Almost surely, 2^2656662638 is an apocalyptic number.

2656662638 is a deficient number, since it is larger than the sum of its proper divisors (1948790002).

2656662638 is a wasteful number, since it uses less digits than its factorization.

2656662638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132251.

The product of its digits is 3732480, while the sum is 50.

The square root of 2656662638 is about 51542.8233413731. The cubic root of 2656662638 is about 1384.9862741540.

The spelling of 2656662638 in words is "two billion, six hundred fifty-six million, six hundred sixty-two thousand, six hundred thirty-eight".