556656105091 has 2 divisors, whose sum is σ = 556656105092. Its totient is φ = 556656105090.

The previous prime is 556656105067. The next prime is 556656105127. The reversal of 556656105091 is 190501656655.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556656105091 - 2²³ = 556647716483 is a prime.

It is a super-2 number, since 2×556656105091² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (556656106091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278328052545 + 278328052546.

It is an arithmetic number, because the mean of its divisors is an integer number (278328052546).

Almost surely, 2^556656105091 is an apocalyptic number.

556656105091 is a deficient number, since it is larger than the sum of its proper divisors (1).

556656105091 is an equidigital number, since it uses as much as digits as its factorization.

556656105091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215000, while the sum is 49.

The spelling of 556656105091 in words is "five hundred fifty-six billion, six hundred fifty-six million, one hundred five thousand, ninety-one".