111661488 has 60 divisors (see below), whose sum is σ = 313266408. Its totient is φ = 37128960.

The previous prime is 111661471. The next prime is 111661493. The reversal of 111661488 is 884166111.

111661488 is a `hidden beast` number, since 1 + 116 + 61 + 488 = 666.

It is a Cunningham number, because it is equal to 10567²-1.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83868 + ... + 85188.

Almost surely, 2^111661488 is an apocalyptic number.

111661488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

111661488 is an abundant number, since it is smaller than the sum of its proper divisors (201604920).

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

111661488 is a wasteful number, since it uses less digits than its factorization.

111661488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1913 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 111661488 is about 10566.9999526829. Note that the first 4 decimals coincide. The cubic root of 111661488 is about 481.5423305596.

The spelling of 111661488 in words is "one hundred eleven million, six hundred sixty-one thousand, four hundred eighty-eight".