27812261947 has 2 divisors, whose sum is σ = 27812261948. Its totient is φ = 27812261946.

The previous prime is 27812261887. The next prime is 27812261969. The reversal of 27812261947 is 74916221872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27812261947 - 2³¹ = 25664778299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27812261947.

It is not a weakly prime, because it can be changed into another prime (27812268947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13906130973 + 13906130974.

It is an arithmetic number, because the mean of its divisors is an integer number (13906130974).

Almost surely, 2^27812261947 is an apocalyptic number.

27812261947 is a deficient number, since it is larger than the sum of its proper divisors (1).

27812261947 is an equidigital number, since it uses as much as digits as its factorization.

27812261947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The spelling of 27812261947 in words is "twenty-seven billion, eight hundred twelve million, two hundred sixty-one thousand, nine hundred forty-seven".