27945858461 has 2 divisors, whose sum is σ = 27945858462. Its totient is φ = 27945858460.

The previous prime is 27945858389. The next prime is 27945858469. The reversal of 27945858461 is 16485854972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20185305625 + 7760552836 = 142075^2 + 88094^2 .

It is a cyclic number.

It is not a de Polignac number, because 27945858461 - 2¹⁸ = 27945596317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27945858461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27945858469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13972929230 + 13972929231.

It is an arithmetic number, because the mean of its divisors is an integer number (13972929231).

Almost surely, 2^27945858461 is an apocalyptic number.

It is an amenable number.

27945858461 is a deficient number, since it is larger than the sum of its proper divisors (1).

27945858461 is an equidigital number, since it uses as much as digits as its factorization.

27945858461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19353600, while the sum is 59.

The spelling of 27945858461 in words is "twenty-seven billion, nine hundred forty-five million, eight hundred fifty-eight thousand, four hundred sixty-one".