11687967749 has 2 divisors, whose sum is σ = 11687967750. Its totient is φ = 11687967748.

The previous prime is 11687967737. The next prime is 11687967757. The reversal of 11687967749 is 94776978611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6071214724 + 5616753025 = 77918^2 + 74945^2 .

It is a cyclic number.

It is not a de Polignac number, because 11687967749 - 2⁸ = 11687967493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11687961749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5843983874 + 5843983875.

It is an arithmetic number, because the mean of its divisors is an integer number (5843983875).

Almost surely, 2^11687967749 is an apocalyptic number.

It is an amenable number.

11687967749 is a deficient number, since it is larger than the sum of its proper divisors (1).

11687967749 is an equidigital number, since it uses as much as digits as its factorization.

11687967749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32006016, while the sum is 65.

The spelling of 11687967749 in words is "eleven billion, six hundred eighty-seven million, nine hundred sixty-seven thousand, seven hundred forty-nine".