6656642466553 has 2 divisors, whose sum is σ = 6656642466554. Its totient is φ = 6656642466552.

The previous prime is 6656642466491. The next prime is 6656642466581. The reversal of 6656642466553 is 3556642466566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6443312103424 + 213330363129 = 2538368^2 + 461877^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656642466553 - 2³³ = 6648052531961 is a prime.

It is not a weakly prime, because it can be changed into another prime (6656642469553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328321233276 + 3328321233277.

It is an arithmetic number, because the mean of its divisors is an integer number (3328321233277).

Almost surely, 2^{6656642466553} is an apocalyptic number.

It is an amenable number.

6656642466553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656642466553 is an equidigital number, since it uses as much as digits as its factorization.

6656642466553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872000, while the sum is 64.

The spelling of 6656642466553 in words is "six trillion, six hundred fifty-six billion, six hundred forty-two million, four hundred sixty-six thousand, five hundred fifty-three".