27621623257 has 2 divisors, whose sum is σ = 27621623258. Its totient is φ = 27621623256.

The previous prime is 27621623251. The next prime is 27621623297. The reversal of 27621623257 is 75232612672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22313189376 + 5308433881 = 149376^2 + 72859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27621623257 is a prime.

It is not a weakly prime, because it can be changed into another prime (27621623251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13810811628 + 13810811629.

It is an arithmetic number, because the mean of its divisors is an integer number (13810811629).

Almost surely, 2^27621623257 is an apocalyptic number.

It is an amenable number.

27621623257 is a deficient number, since it is larger than the sum of its proper divisors (1).

27621623257 is an equidigital number, since it uses as much as digits as its factorization.

27621623257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 43.

The spelling of 27621623257 in words is "twenty-seven billion, six hundred twenty-one million, six hundred twenty-three thousand, two hundred fifty-seven".