1166636687 has 4 divisors (see below), whose sum is σ = 1181404320. Its totient is φ = 1151869056.

The previous prime is 1166636683. The next prime is 1166636717. The reversal of 1166636687 is 7866366611.

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

It is a cyclic number.

It is not a de Polignac number, because 1166636687 - 2² = 1166636683 is a prime.

It is a super-2 number, since 2×1166636687² = 2722082318908671938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166636683) 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, 7383698 + ... + 7383855.

It is an arithmetic number, because the mean of its divisors is an integer number (295351080).

Almost surely, 2^1166636687 is an apocalyptic number.

1166636687 is a deficient number, since it is larger than the sum of its proper divisors (14767633).

1166636687 is an equidigital number, since it uses as much as digits as its factorization.

1166636687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14767632.

The product of its digits is 1306368, while the sum is 50.

The square root of 1166636687 is about 34156.0636929960. The cubic root of 1166636687 is about 1052.7175822771.

The spelling of 1166636687 in words is "one billion, one hundred sixty-six million, six hundred thirty-six thousand, six hundred eighty-seven".