99901987955579 has 2 divisors, whose sum is σ = 99901987955580. Its totient is φ = 99901987955578.

The previous prime is 99901987955563. The next prime is 99901987955593. The reversal of 99901987955579 is 97555978910999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99901987955579 - 2⁴ = 99901987955563 is a prime.

It is not a weakly prime, because it can be changed into another prime (99901987955779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49950993977789 + 49950993977790.

It is an arithmetic number, because the mean of its divisors is an integer number (49950993977790).

Almost surely, 2^{99901987955579} is an apocalyptic number.

99901987955579 is a deficient number, since it is larger than the sum of its proper divisors (1).

99901987955579 is an equidigital number, since it uses as much as digits as its factorization.

99901987955579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26040609000, while the sum is 92.

The spelling of 99901987955579 in words is "ninety-nine trillion, nine hundred one billion, nine hundred eighty-seven million, nine hundred fifty-five thousand, five hundred seventy-nine".