27842350681 has 2 divisors, whose sum is σ = 27842350682. Its totient is φ = 27842350680.

The previous prime is 27842350673. The next prime is 27842350687. The reversal of 27842350681 is 18605324872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17322771456 + 10519579225 = 131616^2 + 102565^2 .

It is a cyclic number.

It is not a de Polignac number, because 27842350681 - 2³ = 27842350673 is a prime.

It is a super-2 number, since 2×27842350681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27842350687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13921175340 + 13921175341.

It is an arithmetic number, because the mean of its divisors is an integer number (13921175341).

Almost surely, 2^27842350681 is an apocalyptic number.

It is an amenable number.

27842350681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27842350681 is an equidigital number, since it uses as much as digits as its factorization.

27842350681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 27842350681 in words is "twenty-seven billion, eight hundred forty-two million, three hundred fifty thousand, six hundred eighty-one".