1166606665 has 16 divisors (see below), whose sum is σ = 1600704000. Its totient is φ = 799565760.

The previous prime is 1166606659. The next prime is 1166606677. The reversal of 1166606665 is 5666066611.

It is a de Polignac number, because none of the positive numbers 2^k-1166606665 is a prime.

It is a super-2 number, since 2×1166606665² = 2721942221644844450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76336 + ... + 90334.

It is an arithmetic number, because the mean of its divisors is an integer number (100044000).

Almost surely, 2^1166606665 is an apocalyptic number.

It is an amenable number.

1166606665 is a deficient number, since it is larger than the sum of its proper divisors (434097335).

1166606665 is a wasteful number, since it uses less digits than its factorization.

1166606665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16392.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 1166606665 is about 34155.6242074420. The cubic root of 1166606665 is about 1052.7085520570.

The spelling of 1166606665 in words is "one billion, one hundred sixty-six million, six hundred six thousand, six hundred sixty-five".