90971863985 has 32 divisors (see below), whose sum is σ = 110652106752. Its totient is φ = 71795885760.

The previous prime is 90971863963. The next prime is 90971863993. The reversal of 90971863985 is 58936817909.

It is not a de Polignac number, because 90971863985 - 2¹⁸ = 90971601841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76639562 + ... + 76640748.

It is an arithmetic number, because the mean of its divisors is an integer number (3457878336).

Almost surely, 2^90971863985 is an apocalyptic number.

It is an amenable number.

90971863985 is a deficient number, since it is larger than the sum of its proper divisors (19680242767).

90971863985 is a wasteful number, since it uses less digits than its factorization.

90971863985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 90971863985 in words is "ninety billion, nine hundred seventy-one million, eight hundred sixty-three thousand, nine hundred eighty-five".