27857796497 has 2 divisors, whose sum is σ = 27857796498. Its totient is φ = 27857796496.

The previous prime is 27857796493. The next prime is 27857796511. The reversal of 27857796497 is 79469775872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23982858496 + 3874938001 = 154864^2 + 62249^2 .

It is a cyclic number.

It is not a de Polignac number, because 27857796497 - 2² = 27857796493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27857796497.

It is not a weakly prime, because it can be changed into another prime (27857796493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13928898248 + 13928898249.

It is an arithmetic number, because the mean of its divisors is an integer number (13928898249).

Almost surely, 2^27857796497 is an apocalyptic number.

It is an amenable number.

27857796497 is a deficient number, since it is larger than the sum of its proper divisors (1).

27857796497 is an equidigital number, since it uses as much as digits as its factorization.

27857796497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373403520, while the sum is 71.

The spelling of 27857796497 in words is "twenty-seven billion, eight hundred fifty-seven million, seven hundred ninety-six thousand, four hundred ninety-seven".