27399375397 has 2 divisors, whose sum is σ = 27399375398. Its totient is φ = 27399375396.

The previous prime is 27399375373. The next prime is 27399375401. The reversal of 27399375397 is 79357399372.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15204369636 + 12195005761 = 123306^2 + 110431^2 .

It is a cyclic number.

It is not a de Polignac number, because 27399375397 - 2²⁷ = 27265157669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27399375317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13699687698 + 13699687699.

It is an arithmetic number, because the mean of its divisors is an integer number (13699687699).

Almost surely, 2^27399375397 is an apocalyptic number.

It is an amenable number.

27399375397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27399375397 is an equidigital number, since it uses as much as digits as its factorization.

27399375397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67512690, while the sum is 64.

The spelling of 27399375397 in words is "twenty-seven billion, three hundred ninety-nine million, three hundred seventy-five thousand, three hundred ninety-seven".