27712959775981 has 2 divisors, whose sum is σ = 27712959775982. Its totient is φ = 27712959775980.

The previous prime is 27712959775957. The next prime is 27712959776207. The reversal of 27712959775981 is 18957795921772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21890149473481 + 5822810302500 = 4678691^2 + 2413050^2 .

It is a cyclic number.

It is not a de Polignac number, because 27712959775981 - 2²⁵ = 27712926221549 is a prime.

It is a super-2 number, since 2×27712959775981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27712959775381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13856479887990 + 13856479887991.

It is an arithmetic number, because the mean of its divisors is an integer number (13856479887991).

Almost surely, 2^{27712959775981} is an apocalyptic number.

It is an amenable number.

27712959775981 is a deficient number, since it is larger than the sum of its proper divisors (1).

27712959775981 is an equidigital number, since it uses as much as digits as its factorization.

27712959775981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400263200, while the sum is 79.

The spelling of 27712959775981 in words is "twenty-seven trillion, seven hundred twelve billion, nine hundred fifty-nine million, seven hundred seventy-five thousand, nine hundred eighty-one".