90520860985 has 16 divisors (see below), whose sum is σ = 109802609856. Its totient is φ = 71633643328.

The previous prime is 90520860973. The next prime is 90520861003. The reversal of 90520860985 is 58906802509.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90520860985 is a prime.

It is a Duffinian number.

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, 237234 + ... + 487156.

It is an arithmetic number, because the mean of its divisors is an integer number (6862663116).

Almost surely, 2^90520860985 is an apocalyptic number.

It is an amenable number.

90520860985 is a deficient number, since it is larger than the sum of its proper divisors (19281748871).

90520860985 is a wasteful number, since it uses less digits than its factorization.

90520860985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250712.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 90520860985 in words is "ninety billion, five hundred twenty million, eight hundred sixty thousand, nine hundred eighty-five".