11979878785 has 32 divisors (see below), whose sum is σ = 17320730112. Its totient is φ = 7776552960.

The previous prime is 11979878783. The next prime is 11979878791. The reversal of 11979878785 is 58787897911.

It is not a de Polignac number, because 11979878785 - 2¹ = 11979878783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11979878783) 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, 1375 + ... + 154795.

It is an arithmetic number, because the mean of its divisors is an integer number (541272816).

Almost surely, 2^11979878785 is an apocalyptic number.

It is an amenable number.

11979878785 is a deficient number, since it is larger than the sum of its proper divisors (5340851327).

11979878785 is a wasteful number, since it uses less digits than its factorization.

11979878785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153553.

The product of its digits is 71124480, while the sum is 70.

The spelling of 11979878785 in words is "eleven billion, nine hundred seventy-nine million, eight hundred seventy-eight thousand, seven hundred eighty-five".