99879940613 has 2 divisors, whose sum is σ = 99879940614. Its totient is φ = 99879940612.

The previous prime is 99879940543. The next prime is 99879940637. The reversal of 99879940613 is 31604997899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80637257089 + 19242683524 = 283967^2 + 138718^2 .

It is an emirp because it is prime and its reverse (31604997899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99879940613 - 2⁸ = 99879940357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99879940613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99879940213) 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, 49939970306 + 49939970307.

It is an arithmetic number, because the mean of its divisors is an integer number (49939970307).

Almost surely, 2^99879940613 is an apocalyptic number.

It is an amenable number.

99879940613 is a deficient number, since it is larger than the sum of its proper divisors (1).

99879940613 is an equidigital number, since it uses as much as digits as its factorization.

99879940613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 65.

The spelling of 99879940613 in words is "ninety-nine billion, eight hundred seventy-nine million, nine hundred forty thousand, six hundred thirteen".