27257742649 has 2 divisors, whose sum is σ = 27257742650. Its totient is φ = 27257742648.

The previous prime is 27257742563. The next prime is 27257742653. The reversal of 27257742649 is 94624775272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16417809424 + 10839933225 = 128132^2 + 104115^2 .

It is a cyclic number.

It is not a de Polignac number, because 27257742649 - 2⁷ = 27257742521 is a prime.

It is a super-2 number, since 2×27257742649² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27257742649.

It is not a weakly prime, because it can be changed into another prime (27257742049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13628871324 + 13628871325.

It is an arithmetic number, because the mean of its divisors is an integer number (13628871325).

Almost surely, 2^27257742649 is an apocalyptic number.

It is an amenable number.

27257742649 is a deficient number, since it is larger than the sum of its proper divisors (1).

27257742649 is an equidigital number, since it uses as much as digits as its factorization.

27257742649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11854080, while the sum is 55.

The spelling of 27257742649 in words is "twenty-seven billion, two hundred fifty-seven million, seven hundred forty-two thousand, six hundred forty-nine".