111991411077420 has 144 divisors (see below), whose sum is σ = 364775768437248. Its totient is φ = 25597774097280.

The previous prime is 111991411077419. The next prime is 111991411077467. The reversal of 111991411077420 is 24770114199111.

It is a happy number.

It is a super-2 number, since 2×111991411077420² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111991411077420.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 542535549 + ... + 542741931.

It is an arithmetic number, because the mean of its divisors is an integer number (2533165058592).

Almost surely, 2^{111991411077420} is an apocalyptic number.

111991411077420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111991411077420 is an abundant number, since it is smaller than the sum of its proper divisors (252784357359828).

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

111991411077420 is a wasteful number, since it uses less digits than its factorization.

111991411077420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390980 (or 390971 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 48.

The spelling of 111991411077420 in words is "one hundred eleven trillion, nine hundred ninety-one billion, four hundred eleven million, seventy-seven thousand, four hundred twenty".