27664071577 has 2 divisors, whose sum is σ = 27664071578. Its totient is φ = 27664071576.

The previous prime is 27664071551. The next prime is 27664071619. The reversal of 27664071577 is 77517046672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21981324121 + 5682747456 = 148261^2 + 75384^2 .

It is a cyclic number.

It is not a de Polignac number, because 27664071577 - 2²⁷ = 27529853849 is a prime.

It is not a weakly prime, because it can be changed into another prime (27664071517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13832035788 + 13832035789.

It is an arithmetic number, because the mean of its divisors is an integer number (13832035789).

Almost surely, 2^27664071577 is an apocalyptic number.

It is an amenable number.

27664071577 is a deficient number, since it is larger than the sum of its proper divisors (1).

27664071577 is an equidigital number, since it uses as much as digits as its factorization.

27664071577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 52.

The spelling of 27664071577 in words is "twenty-seven billion, six hundred sixty-four million, seventy-one thousand, five hundred seventy-seven".