27726624157 has 2 divisors, whose sum is σ = 27726624158. Its totient is φ = 27726624156.

The previous prime is 27726624139. The next prime is 27726624169. The reversal of 27726624157 is 75142662772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20672975961 + 7053648196 = 143781^2 + 83986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27726624157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27726624157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27726624557) 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, 13863312078 + 13863312079.

It is an arithmetic number, because the mean of its divisors is an integer number (13863312079).

Almost surely, 2^27726624157 is an apocalyptic number.

It is an amenable number.

27726624157 is a deficient number, since it is larger than the sum of its proper divisors (1).

27726624157 is an equidigital number, since it uses as much as digits as its factorization.

27726624157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1975680, while the sum is 49.

The spelling of 27726624157 in words is "twenty-seven billion, seven hundred twenty-six million, six hundred twenty-four thousand, one hundred fifty-seven".