2656660556990 has 16 divisors (see below), whose sum is σ = 5216715275760. Its totient is φ = 966058384320.

The previous prime is 2656660556989. The next prime is 2656660556999. The reversal of 2656660556990 is 996550666562.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656660556999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12075729695 + ... + 12075729914.

It is an arithmetic number, because the mean of its divisors is an integer number (326044704735).

Almost surely, 2^{2656660556990} is an apocalyptic number.

2656660556990 is a deficient number, since it is larger than the sum of its proper divisors (2560054718770).

2656660556990 is a wasteful number, since it uses less digits than its factorization.

2656660556990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24151459627.

The product of its (nonzero) digits is 157464000, while the sum is 65.

The spelling of 2656660556990 in words is "two trillion, six hundred fifty-six billion, six hundred sixty million, five hundred fifty-six thousand, nine hundred ninety".