90985801845 has 16 divisors (see below), whose sum is σ = 145581814080. Its totient is φ = 48524250624.

The previous prime is 90985801811. The next prime is 90985801853. The reversal of 90985801845 is 54810858909.

It is not a de Polignac number, because 90985801845 - 2⁸ = 90985801589 is a prime.

It is a super-2 number, since 2×90985801845² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 541986 + ... + 689724.

It is an arithmetic number, because the mean of its divisors is an integer number (9098863380).

Almost surely, 2^90985801845 is an apocalyptic number.

It is an amenable number.

90985801845 is a deficient number, since it is larger than the sum of its proper divisors (54596012235).

90985801845 is a wasteful number, since it uses less digits than its factorization.

90985801845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188804.

The product of its (nonzero) digits is 4147200, while the sum is 57.

The spelling of 90985801845 in words is "ninety billion, nine hundred eighty-five million, eight hundred one thousand, eight hundred forty-five".