90918989018 has 16 divisors (see below), whose sum is σ = 160220876256. Its totient is φ = 38147827440.

The previous prime is 90918989017. The next prime is 90918989023. The reversal of 90918989018 is 81098981909.

It is not an unprimeable number, because it can be changed into a prime (90918989017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158948996 + ... + 158949567.

It is an arithmetic number, because the mean of its divisors is an integer number (10013804766).

Almost surely, 2^90918989018 is an apocalyptic number.

90918989018 is a deficient number, since it is larger than the sum of its proper divisors (69301887238).

90918989018 is a wasteful number, since it uses less digits than its factorization.

90918989018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317898589.

The product of its (nonzero) digits is 3359232, while the sum is 62.

The spelling of 90918989018 in words is "ninety billion, nine hundred eighteen million, nine hundred eighty-nine thousand, eighteen".