27874021657 has 2 divisors, whose sum is σ = 27874021658. Its totient is φ = 27874021656.

The previous prime is 27874021639. The next prime is 27874021673. The reversal of 27874021657 is 75612047872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27654359616 + 219662041 = 166296^2 + 14821^2 .

It is a cyclic number.

It is not a de Polignac number, because 27874021657 - 2¹⁵ = 27873988889 is a prime.

It is a super-2 number, since 2×27874021657² (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 27874021657.

It is not a weakly prime, because it can be changed into another prime (27874021697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13937010828 + 13937010829.

It is an arithmetic number, because the mean of its divisors is an integer number (13937010829).

Almost surely, 2^27874021657 is an apocalyptic number.

It is an amenable number.

27874021657 is a deficient number, since it is larger than the sum of its proper divisors (1).

27874021657 is an equidigital number, since it uses as much as digits as its factorization.

27874021657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1317120, while the sum is 49.

The spelling of 27874021657 in words is "twenty-seven billion, eight hundred seventy-four million, twenty-one thousand, six hundred fifty-seven".