111755661 has 4 divisors (see below), whose sum is σ = 149007552. Its totient is φ = 74503772.

The previous prime is 111755621. The next prime is 111755687. The reversal of 111755661 is 166557111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111755661 - 2¹¹ = 111753613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111755621) 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, 18625941 + ... + 18625946.

It is an arithmetic number, because the mean of its divisors is an integer number (37251888).

Almost surely, 2^111755661 is an apocalyptic number.

It is an amenable number.

111755661 is a deficient number, since it is larger than the sum of its proper divisors (37251891).

111755661 is an equidigital number, since it uses as much as digits as its factorization.

111755661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37251890.

The product of its digits is 6300, while the sum is 33.

The square root of 111755661 is about 10571.4550086542. The cubic root of 111755661 is about 481.6776668159.

It can be divided in two parts, 11175 and 5661, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 111755661 in words is "one hundred eleven million, seven hundred fifty-five thousand, six hundred sixty-one".