99947479187 has 2 divisors, whose sum is σ = 99947479188. Its totient is φ = 99947479186.

The previous prime is 99947479153. The next prime is 99947479213. The reversal of 99947479187 is 78197474999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99947479187 - 2¹⁸ = 99947217043 is a prime.

It is not a weakly prime, because it can be changed into another prime (99947479117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49973739593 + 49973739594.

It is an arithmetic number, because the mean of its divisors is an integer number (49973739594).

Almost surely, 2^99947479187 is an apocalyptic number.

99947479187 is a deficient number, since it is larger than the sum of its proper divisors (1).

99947479187 is an equidigital number, since it uses as much as digits as its factorization.

99947479187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288054144, while the sum is 74.

The spelling of 99947479187 in words is "ninety-nine billion, nine hundred forty-seven million, four hundred seventy-nine thousand, one hundred eighty-seven".