27719139157 has 2 divisors, whose sum is σ = 27719139158. Its totient is φ = 27719139156.

The previous prime is 27719139143. The next prime is 27719139187. The reversal of 27719139157 is 75193191772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27050709841 + 668429316 = 164471^2 + 25854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27719139157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27719139187) 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, 13859569578 + 13859569579.

It is an arithmetic number, because the mean of its divisors is an integer number (13859569579).

Almost surely, 2^27719139157 is an apocalyptic number.

It is an amenable number.

27719139157 is a deficient number, since it is larger than the sum of its proper divisors (1).

27719139157 is an equidigital number, since it uses as much as digits as its factorization.

27719139157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 833490, while the sum is 52.

The spelling of 27719139157 in words is "twenty-seven billion, seven hundred nineteen million, one hundred thirty-nine thousand, one hundred fifty-seven".