111644661 has 16 divisors (see below), whose sum is σ = 158760000. Its totient is φ = 69543168.

The previous prime is 111644653. The next prime is 111644669. The reversal of 111644661 is 166446111.

It is an interprime number because it is at equal distance from previous prime (111644653) and next prime (111644669).

It is not a de Polignac number, because 111644661 - 2³ = 111644653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111644669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 786 + ... + 14963.

It is an arithmetic number, because the mean of its divisors is an integer number (9922500).

Almost surely, 2^111644661 is an apocalyptic number.

It is an amenable number.

111644661 is a deficient number, since it is larger than the sum of its proper divisors (47115339).

111644661 is a wasteful number, since it uses less digits than its factorization.

111644661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15908.

The product of its digits is 3456, while the sum is 30.

The square root of 111644661 is about 10566.2037175137. The cubic root of 111644661 is about 481.5181404233.

The spelling of 111644661 in words is "one hundred eleven million, six hundred forty-four thousand, six hundred sixty-one".