11918909980 has 24 divisors (see below), whose sum is σ = 25155496800. Its totient is φ = 4743604800.

The previous prime is 11918909953. The next prime is 11918909999. The reversal of 11918909980 is 8990981911.

It is a super-2 number, since 2×11918909980² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1493371 + ... + 1501330.

It is an arithmetic number, because the mean of its divisors is an integer number (1048145700).

Almost surely, 2^11918909980 is an apocalyptic number.

11918909980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11918909980 is an abundant number, since it is smaller than the sum of its proper divisors (13236586820).

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

11918909980 is a wasteful number, since it uses less digits than its factorization.

11918909980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994909 (or 2994907 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 55.

The spelling of 11918909980 in words is "eleven billion, nine hundred eighteen million, nine hundred nine thousand, nine hundred eighty".