11687961749 has 2 divisors, whose sum is σ = 11687961750. Its totient is φ = 11687961748.

The previous prime is 11687961721. The next prime is 11687961767. The reversal of 11687961749 is 94716978611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11646294724 + 41667025 = 107918^2 + 6455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11687961749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11687961449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5843980874 + 5843980875.

It is an arithmetic number, because the mean of its divisors is an integer number (5843980875).

Almost surely, 2^11687961749 is an apocalyptic number.

It is an amenable number.

11687961749 is a deficient number, since it is larger than the sum of its proper divisors (1).

11687961749 is an equidigital number, since it uses as much as digits as its factorization.

11687961749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 59.

The spelling of 11687961749 in words is "eleven billion, six hundred eighty-seven million, nine hundred sixty-one thousand, seven hundred forty-nine".