99999990101009 has 2 divisors, whose sum is σ = 99999990101010. Its totient is φ = 99999990101008.

The previous prime is 99999990100987. The next prime is 99999990101059. The reversal of 99999990101009 is 90010109999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99880595664784 + 119394436225 = 9994028^2 + 345535^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999990101009 - 2⁸ = 99999990100753 is a prime.

It is not a weakly prime, because it can be changed into another prime (99999990101059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999995050504 + 49999995050505.

It is an arithmetic number, because the mean of its divisors is an integer number (49999995050505).

Almost surely, 2^{99999990101009} is an apocalyptic number.

It is an amenable number.

99999990101009 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999990101009 is an equidigital number, since it uses as much as digits as its factorization.

99999990101009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43046721, while the sum is 74.

The spelling of 99999990101009 in words is "ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety million, one hundred one thousand, nine".