111601660 has 12 divisors (see below), whose sum is σ = 234363528. Its totient is φ = 44640656.

The previous prime is 111601613. The next prime is 111601669. The reversal of 111601660 is 66106111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111601669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790022 + ... + 2790061.

It is an arithmetic number, because the mean of its divisors is an integer number (19530294).

Almost surely, 2^111601660 is an apocalyptic number.

111601660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111601660 is an abundant number, since it is smaller than the sum of its proper divisors (122761868).

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

111601660 is a wasteful number, since it uses less digits than its factorization.

111601660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580092 (or 5580090 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 111601660 is about 10564.1686847570. The cubic root of 111601660 is about 481.4563120585.

Adding to 111601660 its reverse (66106111), we get a palindrome (177707771).

The spelling of 111601660 in words is "one hundred eleven million, six hundred one thousand, six hundred sixty".