27648631397 has 2 divisors, whose sum is σ = 27648631398. Its totient is φ = 27648631396.

The previous prime is 27648631379. The next prime is 27648631457. The reversal of 27648631397 is 79313684672.

Together with previous prime (27648631379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23459823556 + 4188807841 = 153166^2 + 64721^2 .

It is a cyclic number.

It is not a de Polignac number, because 27648631397 - 2⁶ = 27648631333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27648631357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13824315698 + 13824315699.

It is an arithmetic number, because the mean of its divisors is an integer number (13824315699).

Almost surely, 2^27648631397 is an apocalyptic number.

It is an amenable number.

27648631397 is a deficient number, since it is larger than the sum of its proper divisors (1).

27648631397 is an equidigital number, since it uses as much as digits as its factorization.

27648631397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 56.

The spelling of 27648631397 in words is "twenty-seven billion, six hundred forty-eight million, six hundred thirty-one thousand, three hundred ninety-seven".