111580661 has 8 divisors (see below), whose sum is σ = 117153120. Its totient is φ = 106123248.

The previous prime is 111580633. The next prime is 111580669. The reversal of 111580661 is 166085111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111580661 - 2¹⁸ = 111318517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111580669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26771 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (14644140).

Almost surely, 2^111580661 is an apocalyptic number.

It is an amenable number.

111580661 is a deficient number, since it is larger than the sum of its proper divisors (5572459).

111580661 is an equidigital number, since it uses as much as digits as its factorization.

111580661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57523.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 111580661 is about 10563.1747595124. The cubic root of 111580661 is about 481.4261131790.

The spelling of 111580661 in words is "one hundred eleven million, five hundred eighty thousand, six hundred sixty-one".