99999651187 has 2 divisors, whose sum is σ = 99999651188. Its totient is φ = 99999651186.

The previous prime is 99999651173. The next prime is 99999651209. The reversal of 99999651187 is 78115699999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999651187 is a prime.

It is a super-3 number, since 3×99999651187³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (99999657187) 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, 49999825593 + 49999825594.

It is an arithmetic number, because the mean of its divisors is an integer number (49999825594).

Almost surely, 2^99999651187 is an apocalyptic number.

99999651187 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999651187 is an equidigital number, since it uses as much as digits as its factorization.

99999651187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99202320, while the sum is 73.

The spelling of 99999651187 in words is "ninety-nine billion, nine hundred ninety-nine million, six hundred fifty-one thousand, one hundred eighty-seven".