90909900990909 has 48 divisors (see below), whose sum is σ = 176310111030144. Its totient is φ = 43593159312000.

The previous prime is 90909900990847. The next prime is 90909900990911.

90909900990909 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 90909900990909 - 2¹⁶ = 90909900925373 is a prime.

It is a super-2 number, since 2×90909900990909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909900990809) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5045495542 + ... + 5045513559.

It is an arithmetic number, because the mean of its divisors is an integer number (3673127313128).

Almost surely, 2^{90909900990909} is an apocalyptic number.

90909900990909 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

90909900990909 is a deficient number, since it is larger than the sum of its proper divisors (85400210039235).

90909900990909 is a wasteful number, since it uses less digits than its factorization.

90909900990909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10091009138 (or 10091009135 counting only the distinct ones).

The product of its (nonzero) digits is 43046721, while the sum is 72.

The spelling of 90909900990909 in words is "ninety trillion, nine hundred nine billion, nine hundred million, nine hundred ninety thousand, nine hundred nine".