99947479117 has 2 divisors, whose sum is σ = 99947479118. Its totient is φ = 99947479116.

The previous prime is 99947479063. The next prime is 99947479147. The reversal of 99947479117 is 71197474999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80823078436 + 19124400681 = 284294^2 + 138291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99947479117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99947479147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49973739558 + 49973739559.

It is an arithmetic number, because the mean of its divisors is an integer number (49973739559).

Almost surely, 2^99947479117 is an apocalyptic number.

It is an amenable number.

99947479117 is a deficient number, since it is larger than the sum of its proper divisors (1).

99947479117 is an equidigital number, since it uses as much as digits as its factorization.

99947479117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36006768, while the sum is 67.

The spelling of 99947479117 in words is "ninety-nine billion, nine hundred forty-seven million, four hundred seventy-nine thousand, one hundred seventeen".