11664507731 has 2 divisors, whose sum is σ = 11664507732. Its totient is φ = 11664507730.

The previous prime is 11664507719. The next prime is 11664507781. The reversal of 11664507731 is 13770546611.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11664507731 is a prime.

It is a super-2 number, since 2×11664507731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11664507781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5832253865 + 5832253866.

It is an arithmetic number, because the mean of its divisors is an integer number (5832253866).

Almost surely, 2^11664507731 is an apocalyptic number.

11664507731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11664507731 is an equidigital number, since it uses as much as digits as its factorization.

11664507731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 11664507731 in words is "eleven billion, six hundred sixty-four million, five hundred seven thousand, seven hundred thirty-one".