556636636657 has 2 divisors, whose sum is σ = 556636636658. Its totient is φ = 556636636656.

The previous prime is 556636636637. The next prime is 556636636669. The reversal of 556636636657 is 756636636655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388080407521 + 168556229136 = 622961^2 + 410556^2 .

It is a cyclic number.

It is not a de Polignac number, because 556636636657 - 2⁷ = 556636636529 is a prime.

It is a super-3 number, since 3×556636636657³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (556636636637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278318318328 + 278318318329.

It is an arithmetic number, because the mean of its divisors is an integer number (278318318329).

Almost surely, 2^556636636657 is an apocalyptic number.

It is an amenable number.

556636636657 is a deficient number, since it is larger than the sum of its proper divisors (1).

556636636657 is an equidigital number, since it uses as much as digits as its factorization.

556636636657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416000, while the sum is 64.

The spelling of 556636636657 in words is "five hundred fifty-six billion, six hundred thirty-six million, six hundred thirty-six thousand, six hundred fifty-seven".