27819359957 has 2 divisors, whose sum is σ = 27819359958. Its totient is φ = 27819359956.

The previous prime is 27819359951. The next prime is 27819359959. The reversal of 27819359957 is 75995391872.

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., 18800248996 + 9019110961 = 137114^2 + 94969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27819359957 is a prime.

Together with 27819359959, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27819359893 and 27819359902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27819359951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13909679978 + 13909679979.

It is an arithmetic number, because the mean of its divisors is an integer number (13909679979).

Almost surely, 2^27819359957 is an apocalyptic number.

It is an amenable number.

27819359957 is a deficient number, since it is larger than the sum of its proper divisors (1).

27819359957 is an equidigital number, since it uses as much as digits as its factorization.

27819359957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42865200, while the sum is 65.

The spelling of 27819359957 in words is "twenty-seven billion, eight hundred nineteen million, three hundred fifty-nine thousand, nine hundred fifty-seven".