11663066731 has 4 divisors (see below), whose sum is σ = 11666028592. Its totient is φ = 11660104872.

The previous prime is 11663066707. The next prime is 11663066813. The reversal of 11663066731 is 13766036611.

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 11663066731 - 2⁷ = 11663066603 is a prime.

It is a super-2 number, since 2×11663066731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11663066131) 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, 1475016 + ... + 1482901.

It is an arithmetic number, because the mean of its divisors is an integer number (2916507148).

Almost surely, 2^11663066731 is an apocalyptic number.

11663066731 is a deficient number, since it is larger than the sum of its proper divisors (2961861).

11663066731 is an equidigital number, since it uses as much as digits as its factorization.

11663066731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961860.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 11663066731 in words is "eleven billion, six hundred sixty-three million, sixty-six thousand, seven hundred thirty-one".