99909991007 has 2 divisors, whose sum is σ = 99909991008. Its totient is φ = 99909991006.

The previous prime is 99909990989. The next prime is 99909991021. The reversal of 99909991007 is 70019990999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99909991007 - 2²⁶ = 99842882143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99909991037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49954995503 + 49954995504.

It is an arithmetic number, because the mean of its divisors is an integer number (49954995504).

Almost surely, 2^99909991007 is an apocalyptic number.

99909991007 is a deficient number, since it is larger than the sum of its proper divisors (1).

99909991007 is an equidigital number, since it uses as much as digits as its factorization.

99909991007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3720087, while the sum is 62.

The spelling of 99909991007 in words is "ninety-nine billion, nine hundred nine million, nine hundred ninety-one thousand, seven".