90090999985 has 16 divisors (see below), whose sum is σ = 123593882112. Its totient is φ = 61756430400.

The previous prime is 90090999961. The next prime is 90090999991. The reversal of 90090999985 is 58999909009.

It is not a de Polignac number, because 90090999985 - 2¹⁹ = 90090475697 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90090999985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313321 + ... + 527590.

It is an arithmetic number, because the mean of its divisors is an integer number (7724617632).

Almost surely, 2^90090999985 is an apocalyptic number.

It is an amenable number.

90090999985 is a deficient number, since it is larger than the sum of its proper divisors (33502882127).

90090999985 is a wasteful number, since it uses less digits than its factorization.

90090999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843984.

The product of its (nonzero) digits is 21257640, while the sum is 67.

The spelling of 90090999985 in words is "ninety billion, ninety million, nine hundred ninety-nine thousand, nine hundred eighty-five".