27698645251 has 2 divisors, whose sum is σ = 27698645252. Its totient is φ = 27698645250.

The previous prime is 27698645243. The next prime is 27698645269. The reversal of 27698645251 is 15254689672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27698645251 - 2³ = 27698645243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27698645192 and 27698645201.

It is not a weakly prime, because it can be changed into another prime (27698645291) 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, 13849322625 + 13849322626.

It is an arithmetic number, because the mean of its divisors is an integer number (13849322626).

Almost surely, 2^27698645251 is an apocalyptic number.

27698645251 is a deficient number, since it is larger than the sum of its proper divisors (1).

27698645251 is an equidigital number, since it uses as much as digits as its factorization.

27698645251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 55.

The spelling of 27698645251 in words is "twenty-seven billion, six hundred ninety-eight million, six hundred forty-five thousand, two hundred fifty-one".