11978889633 has 16 divisors (see below), whose sum is σ = 17778047040. Its totient is φ = 7971731712.

The previous prime is 11978889631. The next prime is 11978889677. The reversal of 11978889633 is 33698887911.

It is not a de Polignac number, because 11978889633 - 2¹ = 11978889631 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11978889631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378816 + ... + 409217.

It is an arithmetic number, because the mean of its divisors is an integer number (1111127940).

Almost surely, 2^11978889633 is an apocalyptic number.

It is an amenable number.

11978889633 is a deficient number, since it is larger than the sum of its proper divisors (5799157407).

11978889633 is an equidigital number, since it uses as much as digits as its factorization.

11978889633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788605 (or 788599 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 11978889633 in words is "eleven billion, nine hundred seventy-eight million, eight hundred eighty-nine thousand, six hundred thirty-three".