13689691397881 has 2 divisors, whose sum is σ = 13689691397882. Its totient is φ = 13689691397880.

The previous prime is 13689691397839. The next prime is 13689691397939. The reversal of 13689691397881 is 18879319698631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13303782079225 + 385909318656 = 3647435^2 + 621216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13689691397881 is a prime.

It is a super-2 number, since 2×13689691397881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13689691397981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6844845698940 + 6844845698941.

It is an arithmetic number, because the mean of its divisors is an integer number (6844845698941).

Almost surely, 2^{13689691397881} is an apocalyptic number.

It is an amenable number.

13689691397881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13689691397881 is an equidigital number, since it uses as much as digits as its factorization.

13689691397881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846526464, while the sum is 79.

The spelling of 13689691397881 in words is "thirteen trillion, six hundred eighty-nine billion, six hundred ninety-one million, three hundred ninety-seven thousand, eight hundred eighty-one".