111112457780 has 24 divisors (see below), whose sum is σ = 233638051752. Its totient is φ = 44387480192.

The previous prime is 111112457779. The next prime is 111112457849. The reversal of 111112457780 is 87754211111.

It can be written as a sum of positive squares in 4 ways, for example, as 8388361744 + 102724096036 = 91588^2 + 320506^2 .

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, 3578087 + ... + 3609006.

It is an arithmetic number, because the mean of its divisors is an integer number (9734918823).

Almost surely, 2^111112457780 is an apocalyptic number.

111112457780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111112457780 is an abundant number, since it is smaller than the sum of its proper divisors (122525593972).

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

111112457780 is a wasteful number, since it uses less digits than its factorization.

111112457780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7187875 (or 7187873 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 38.

Adding to 111112457780 its reverse (87754211111), we get a palindrome (198866668891).

The spelling of 111112457780 in words is "one hundred eleven billion, one hundred twelve million, four hundred fifty-seven thousand, seven hundred eighty".