111665061 has 24 divisors (see below), whose sum is σ = 177113664. Its totient is φ = 70061760.

The previous prime is 111665053. The next prime is 111665087. The reversal of 111665061 is 160566111.

111665061 is a `hidden beast` number, since 1 + 1 + 1 + 6 + 650 + 6 + 1 = 666.

It is not a de Polignac number, because 111665061 - 2³ = 111665053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111665041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9385 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (7379736).

Almost surely, 2^111665061 is an apocalyptic number.

It is an amenable number.

111665061 is a deficient number, since it is larger than the sum of its proper divisors (65448603).

111665061 is an equidigital number, since it uses as much as digits as its factorization.

111665061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27063 (or 27051 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 111665061 is about 10567.1690153986. The cubic root of 111665061 is about 481.5474667154.

The spelling of 111665061 in words is "one hundred eleven million, six hundred sixty-five thousand, sixty-one".