90663398971 has 4 divisors (see below), whose sum is σ = 90664098712. Its totient is φ = 90662699232.

The previous prime is 90663398927. The next prime is 90663398993. The reversal of 90663398971 is 17989336609.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90663398971 - 2³⁵ = 56303660603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90663398471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92325 + ... + 435718.

It is an arithmetic number, because the mean of its divisors is an integer number (22666024678).

Almost surely, 2^90663398971 is an apocalyptic number.

90663398971 is a deficient number, since it is larger than the sum of its proper divisors (699741).

90663398971 is a wasteful number, since it uses less digits than its factorization.

90663398971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699740.

The product of its (nonzero) digits is 13226976, while the sum is 61.

The spelling of 90663398971 in words is "ninety billion, six hundred sixty-three million, three hundred ninety-eight thousand, nine hundred seventy-one".