27738551657 has 2 divisors, whose sum is σ = 27738551658. Its totient is φ = 27738551656.

The previous prime is 27738551623. The next prime is 27738551663. The reversal of 27738551657 is 75615583772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26277706816 + 1460844841 = 162104^2 + 38221^2 .

It is a cyclic number.

It is not a de Polignac number, because 27738551657 - 2¹⁴ = 27738535273 is a prime.

It is not a weakly prime, because it can be changed into another prime (27738551957) 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, 13869275828 + 13869275829.

It is an arithmetic number, because the mean of its divisors is an integer number (13869275829).

Almost surely, 2^27738551657 is an apocalyptic number.

It is an amenable number.

27738551657 is a deficient number, since it is larger than the sum of its proper divisors (1).

27738551657 is an equidigital number, since it uses as much as digits as its factorization.

27738551657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12348000, while the sum is 56.

The spelling of 27738551657 in words is "twenty-seven billion, seven hundred thirty-eight million, five hundred fifty-one thousand, six hundred fifty-seven".