999999902001 has 16 divisors (see below), whose sum is σ = 1336407272064. Its totient is φ = 665129910144.

The previous prime is 999999901993. The next prime is 999999902017. The reversal of 999999902001 is 100209999999.

It is not a de Polignac number, because 999999902001 - 2³ = 999999901993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999999902201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13155235 + ... + 13231031.

It is an arithmetic number, because the mean of its divisors is an integer number (83525454504).

Almost surely, 2^999999902001 is an apocalyptic number.

It is an amenable number.

999999902001 is a deficient number, since it is larger than the sum of its proper divisors (336407370063).

999999902001 is a wasteful number, since it uses less digits than its factorization.

999999902001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85880.

The product of its (nonzero) digits is 9565938, while the sum is 66.

The spelling of 999999902001 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred two thousand, one".