13757611391981 has 2 divisors, whose sum is σ = 13757611391982. Its totient is φ = 13757611391980.

The previous prime is 13757611391947. The next prime is 13757611392017. The reversal of 13757611391981 is 18919311675731.

13757611391981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9596154190756 + 4161457201225 = 3097766^2 + 2039965^2 .

It is a cyclic number.

It is not a de Polignac number, because 13757611391981 - 2³⁰ = 13756537650157 is a prime.

It is a super-2 number, since 2×13757611391981² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13757611391911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6878805695990 + 6878805695991.

It is an arithmetic number, because the mean of its divisors is an integer number (6878805695991).

Almost surely, 2^{13757611391981} is an apocalyptic number.

It is an amenable number.

13757611391981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13757611391981 is an equidigital number, since it uses as much as digits as its factorization.

13757611391981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 62.

The spelling of 13757611391981 in words is "thirteen trillion, seven hundred fifty-seven billion, six hundred eleven million, three hundred ninety-one thousand, nine hundred eighty-one".