1156665666 has 16 divisors (see below), whose sum is σ = 2491280064. Its totient is φ = 355897104.

The previous prime is 1156665661. The next prime is 1156665691. The reversal of 1156665666 is 6665666511.

It is not an unprimeable number, because it can be changed into a prime (1156665661) 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, 7414446 + ... + 7414601.

It is an arithmetic number, because the mean of its divisors is an integer number (155705004).

Almost surely, 2^1156665666 is an apocalyptic number.

1156665666 is an abundant number, since it is smaller than the sum of its proper divisors (1334614398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1156665666 is a wasteful number, since it uses less digits than its factorization.

1156665666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14829065.

The product of its digits is 1166400, while the sum is 48.

The square root of 1156665666 is about 34009.7877970445. The cubic root of 1156665666 is about 1049.7098717687.

It can be divided in two parts, 115666566 and 6, that multiplied together give a palindrome (693999396).

The spelling of 1156665666 in words is "one billion, one hundred fifty-six million, six hundred sixty-five thousand, six hundred sixty-six".