27815373889 has 2 divisors, whose sum is σ = 27815373890. Its totient is φ = 27815373888.

The previous prime is 27815373881. The next prime is 27815373907. The reversal of 27815373889 is 98837351872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25219980864 + 2595393025 = 158808^2 + 50945^2 .

It is a cyclic number.

It is not a de Polignac number, because 27815373889 - 2³ = 27815373881 is a prime.

It is not a weakly prime, because it can be changed into another prime (27815373881) 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, 13907686944 + 13907686945.

It is an arithmetic number, because the mean of its divisors is an integer number (13907686945).

Almost surely, 2^27815373889 is an apocalyptic number.

It is an amenable number.

27815373889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27815373889 is an equidigital number, since it uses as much as digits as its factorization.

27815373889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 61.

The spelling of 27815373889 in words is "twenty-seven billion, eight hundred fifteen million, three hundred seventy-three thousand, eight hundred eighty-nine".