113665666 has 4 divisors (see below), whose sum is σ = 170498502. Its totient is φ = 56832832.

The previous prime is 113665663. The next prime is 113665679. The reversal of 113665666 is 666566311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 84732025 + 28933641 = 9205^2 + 5379^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (113665661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28416415 + ... + 28416418.

Almost surely, 2^113665666 is an apocalyptic number.

113665666 is a deficient number, since it is larger than the sum of its proper divisors (56832836).

113665666 is an equidigital number, since it uses as much as digits as its factorization.

113665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56832835.

The product of its digits is 116640, while the sum is 40.

The square root of 113665666 is about 10661.4101318728. The cubic root of 113665666 is about 484.4062823834.

The spelling of 113665666 in words is "one hundred thirteen million, six hundred sixty-five thousand, six hundred sixty-six".