90949879811 has 4 divisors (see below), whose sum is σ = 103942719792. Its totient is φ = 77957039832.

The previous prime is 90949879789. The next prime is 90949879817. The reversal of 90949879811 is 11897894909.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90949879811 - 2⁶ = 90949879747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90949879817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6496419980 + ... + 6496419993.

It is an arithmetic number, because the mean of its divisors is an integer number (25985679948).

Almost surely, 2^90949879811 is an apocalyptic number.

90949879811 is a deficient number, since it is larger than the sum of its proper divisors (12992839981).

90949879811 is a wasteful number, since it uses less digits than its factorization.

90949879811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12992839980.

The product of its (nonzero) digits is 11757312, while the sum is 65.

The spelling of 90949879811 in words is "ninety billion, nine hundred forty-nine million, eight hundred seventy-nine thousand, eight hundred eleven".