27397799837 has 2 divisors, whose sum is σ = 27397799838. Its totient is φ = 27397799836.

The previous prime is 27397799813. The next prime is 27397799843. The reversal of 27397799837 is 73899779372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15701593636 + 11696206201 = 125306^2 + 108149^2 .

It is a cyclic number.

It is not a de Polignac number, because 27397799837 - 2⁶ = 27397799773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27397799857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13698899918 + 13698899919.

It is an arithmetic number, because the mean of its divisors is an integer number (13698899919).

Almost surely, 2^27397799837 is an apocalyptic number.

It is an amenable number.

27397799837 is a deficient number, since it is larger than the sum of its proper divisors (1).

27397799837 is an equidigital number, since it uses as much as digits as its factorization.

27397799837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252047376, while the sum is 71.

The spelling of 27397799837 in words is "twenty-seven billion, three hundred ninety-seven million, seven hundred ninety-nine thousand, eight hundred thirty-seven".