99031987755671 has 2 divisors, whose sum is σ = 99031987755672. Its totient is φ = 99031987755670.

The previous prime is 99031987755661. The next prime is 99031987755691. The reversal of 99031987755671 is 17655778913099.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99031987755671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99031987755592 and 99031987755601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99031987755641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49515993877835 + 49515993877836.

It is an arithmetic number, because the mean of its divisors is an integer number (49515993877836).

Almost surely, 2^{99031987755671} is an apocalyptic number.

99031987755671 is a deficient number, since it is larger than the sum of its proper divisors (1).

99031987755671 is an equidigital number, since it uses as much as digits as its factorization.

99031987755671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900169200, while the sum is 77.

The spelling of 99031987755671 in words is "ninety-nine trillion, thirty-one billion, nine hundred eighty-seven million, seven hundred fifty-five thousand, six hundred seventy-one".