11731536666 has 20 divisors (see below), whose sum is σ = 26287332522. Its totient is φ = 3910512168.

The previous prime is 11731536659. The next prime is 11731536671. The reversal of 11731536666 is 66663513711.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11154528225 + 577008441 = 105615^2 + 24021^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36208285 + ... + 36208608.

Almost surely, 2^11731536666 is an apocalyptic number.

11731536666 is an abundant number, since it is smaller than the sum of its proper divisors (14555795856).

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

11731536666 is an equidigital number, since it uses as much as digits as its factorization.

11731536666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72416907 (or 72416898 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The spelling of 11731536666 in words is "eleven billion, seven hundred thirty-one million, five hundred thirty-six thousand, six hundred sixty-six".