27458557445681 has 2 divisors, whose sum is σ = 27458557445682. Its totient is φ = 27458557445680.

The previous prime is 27458557445647. The next prime is 27458557445741. The reversal of 27458557445681 is 18654475585472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22501589165056 + 4956968280625 = 4743584^2 + 2226425^2 .

It is a cyclic number.

It is not a de Polignac number, because 27458557445681 - 2⁶ = 27458557445617 is a prime.

It is a super-2 number, since 2×27458557445681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27458557445611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13729278722840 + 13729278722841.

It is an arithmetic number, because the mean of its divisors is an integer number (13729278722841).

Almost surely, 2^{27458557445681} is an apocalyptic number.

It is an amenable number.

27458557445681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27458557445681 is an equidigital number, since it uses as much as digits as its factorization.

27458557445681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1505280000, while the sum is 71.

The spelling of 27458557445681 in words is "twenty-seven trillion, four hundred fifty-eight billion, five hundred fifty-seven million, four hundred forty-five thousand, six hundred eighty-one".