11978885390920 has 64 divisors (see below), whose sum is σ = 31865015347200. Its totient is φ = 3965424126720.

The previous prime is 11978885390783. The next prime is 11978885390951. The reversal of 11978885390920 is 2909358887911.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 11978885390920.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737607976 + ... + 737624215.

It is an arithmetic number, because the mean of its divisors is an integer number (497890864800).

Almost surely, 2^{11978885390920} is an apocalyptic number.

11978885390920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11978885390920 is an abundant number, since it is smaller than the sum of its proper divisors (19886129956280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11978885390920 is a wasteful number, since it uses less digits than its factorization.

11978885390920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475232238 (or 1475232234 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 70.

The spelling of 11978885390920 in words is "eleven trillion, nine hundred seventy-eight billion, eight hundred eighty-five million, three hundred ninety thousand, nine hundred twenty".