12638875120981 has 2 divisors, whose sum is σ = 12638875120982. Its totient is φ = 12638875120980.

The previous prime is 12638875120967. The next prime is 12638875121011. The reversal of 12638875120981 is 18902157883621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10544574112081 + 2094301008900 = 3247241^2 + 1447170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12638875120981 is a prime.

It is a super-2 number, since 2×12638875120981² (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 (12638875120901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319437560490 + 6319437560491.

It is an arithmetic number, because the mean of its divisors is an integer number (6319437560491).

Almost surely, 2^{12638875120981} is an apocalyptic number.

It is an amenable number.

12638875120981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638875120981 is an equidigital number, since it uses as much as digits as its factorization.

12638875120981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 61.

The spelling of 12638875120981 in words is "twelve trillion, six hundred thirty-eight billion, eight hundred seventy-five million, one hundred twenty thousand, nine hundred eighty-one".