99556656791 has 2 divisors, whose sum is σ = 99556656792. Its totient is φ = 99556656790.

The previous prime is 99556656649. The next prime is 99556656809. The reversal of 99556656791 is 19765665599.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99556656791 is a prime.

It is a super-2 number, since 2×99556656791² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99556656091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49778328395 + 49778328396.

It is an arithmetic number, because the mean of its divisors is an integer number (49778328396).

Almost surely, 2^99556656791 is an apocalyptic number.

99556656791 is a deficient number, since it is larger than the sum of its proper divisors (1).

99556656791 is an equidigital number, since it uses as much as digits as its factorization.

99556656791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137781000, while the sum is 68.

The spelling of 99556656791 in words is "ninety-nine billion, five hundred fifty-six million, six hundred fifty-six thousand, seven hundred ninety-one".