99178861211 has 2 divisors, whose sum is σ = 99178861212. Its totient is φ = 99178861210.

The previous prime is 99178861207. The next prime is 99178861219. The reversal of 99178861211 is 11216887199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99178861211 - 2² = 99178861207 is a prime.

It is a super-2 number, since 2×99178861211² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99178861219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49589430605 + 49589430606.

It is an arithmetic number, because the mean of its divisors is an integer number (49589430606).

Almost surely, 2^99178861211 is an apocalyptic number.

99178861211 is a deficient number, since it is larger than the sum of its proper divisors (1).

99178861211 is an equidigital number, since it uses as much as digits as its factorization.

99178861211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 53.

The spelling of 99178861211 in words is "ninety-nine billion, one hundred seventy-eight million, eight hundred sixty-one thousand, two hundred eleven".