27250777661 has 2 divisors, whose sum is σ = 27250777662. Its totient is φ = 27250777660.

The previous prime is 27250777651. The next prime is 27250777663. The reversal of 27250777661 is 16677705272.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23228808100 + 4021969561 = 152410^2 + 63419^2 .

It is a cyclic number.

It is not a de Polignac number, because 27250777661 - 2⁶ = 27250777597 is a prime.

It is a Sophie Germain prime.

Together with 27250777663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27250777663) 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, 13625388830 + 13625388831.

It is an arithmetic number, because the mean of its divisors is an integer number (13625388831).

Almost surely, 2^27250777661 is an apocalyptic number.

It is an amenable number.

27250777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27250777661 is an equidigital number, since it uses as much as digits as its factorization.

27250777661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728720, while the sum is 50.

The spelling of 27250777661 in words is "twenty-seven billion, two hundred fifty million, seven hundred seventy-seven thousand, six hundred sixty-one".