111111388890 has 64 divisors (see below), whose sum is σ = 268761024000. Its totient is φ = 29397351744.

The previous prime is 111111388879. The next prime is 111111388891. The reversal of 111111388890 is 98883111111.

It is not an unprimeable number, because it can be changed into a prime (111111388891) 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, 7076989 + ... + 7092671.

It is an arithmetic number, because the mean of its divisors is an integer number (4199391000).

Almost surely, 2^111111388890 is an apocalyptic number.

111111388890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111111388890 is an abundant number, since it is smaller than the sum of its proper divisors (157649635110).

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

111111388890 is a wasteful number, since it uses less digits than its factorization.

111111388890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17531.

The product of its (nonzero) digits is 13824, while the sum is 42.

The spelling of 111111388890 in words is "one hundred eleven billion, one hundred eleven million, three hundred eighty-eight thousand, eight hundred ninety".