13757891666381 has 2 divisors, whose sum is σ = 13757891666382. Its totient is φ = 13757891666380.

The previous prime is 13757891666357. The next prime is 13757891666413. The reversal of 13757891666381 is 18366619875731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12623389749481 + 1134501916900 = 3552941^2 + 1065130^2 .

It is an emirp because it is prime and its reverse (18366619875731) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13757891666381 is a prime.

It is a super-2 number, since 2×13757891666381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13757891666081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6878945833190 + 6878945833191.

It is an arithmetic number, because the mean of its divisors is an integer number (6878945833191).

Almost surely, 2^{13757891666381} is an apocalyptic number.

It is an amenable number.

13757891666381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13757891666381 is an equidigital number, since it uses as much as digits as its factorization.

13757891666381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274337280, while the sum is 71.

The spelling of 13757891666381 in words is "thirteen trillion, seven hundred fifty-seven billion, eight hundred ninety-one million, six hundred sixty-six thousand, three hundred eighty-one".