27781870247 has 2 divisors, whose sum is σ = 27781870248. Its totient is φ = 27781870246.

The previous prime is 27781870211. The next prime is 27781870279. The reversal of 27781870247 is 74207818772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27781870247 - 2¹⁶ = 27781804711 is a prime.

It is a super-2 number, since 2×27781870247² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27781870147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890935123 + 13890935124.

It is an arithmetic number, because the mean of its divisors is an integer number (13890935124).

Almost surely, 2^27781870247 is an apocalyptic number.

27781870247 is a deficient number, since it is larger than the sum of its proper divisors (1).

27781870247 is an equidigital number, since it uses as much as digits as its factorization.

27781870247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2458624, while the sum is 53.

The spelling of 27781870247 in words is "twenty-seven billion, seven hundred eighty-one million, eight hundred seventy thousand, two hundred forty-seven".