11859650891 has 32 divisors (see below), whose sum is σ = 14216186880. Its totient is φ = 9766310400.

The previous prime is 11859650863. The next prime is 11859650899. The reversal of 11859650891 is 19805695811.

It is a happy number.

It is not a de Polignac number, because 11859650891 - 2⁶ = 11859650827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11859650899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1791710 + ... + 1798316.

It is an arithmetic number, because the mean of its divisors is an integer number (444255840).

Almost surely, 2^11859650891 is an apocalyptic number.

11859650891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11859650891 is a deficient number, since it is larger than the sum of its proper divisors (2356535989).

11859650891 is a wasteful number, since it uses less digits than its factorization.

11859650891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6995.

The product of its (nonzero) digits is 777600, while the sum is 53.

The spelling of 11859650891 in words is "eleven billion, eight hundred fifty-nine million, six hundred fifty thousand, eight hundred ninety-one".