1166511566 has 8 divisors (see below), whose sum is σ = 1908837144. Its totient is φ = 530232520.

The previous prime is 1166511527. The next prime is 1166511581. The reversal of 1166511566 is 6651156611.

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

It is a super-2 number, since 2×1166511566² = 2721498467223544712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26511605 + ... + 26511648.

It is an arithmetic number, because the mean of its divisors is an integer number (238604643).

Almost surely, 2^1166511566 is an apocalyptic number.

1166511566 is a deficient number, since it is larger than the sum of its proper divisors (742325578).

1166511566 is a wasteful number, since it uses less digits than its factorization.

1166511566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53023266.

The product of its digits is 32400, while the sum is 38.

The square root of 1166511566 is about 34154.2320364549. The cubic root of 1166511566 is about 1052.6799465141.

The spelling of 1166511566 in words is "one billion, one hundred sixty-six million, five hundred eleven thousand, five hundred sixty-six".