647771243239 has 2 divisors, whose sum is σ = 647771243240. Its totient is φ = 647771243238.

The previous prime is 647771243183. The next prime is 647771243257. The reversal of 647771243239 is 932342177746.

647771243239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647771243239 - 2⁷ = 647771243111 is a prime.

It is a super-2 number, since 2×647771243239² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647771243239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647771243269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323885621619 + 323885621620.

It is an arithmetic number, because the mean of its divisors is an integer number (323885621620).

Almost surely, 2^647771243239 is an apocalyptic number.

647771243239 is a deficient number, since it is larger than the sum of its proper divisors (1).

647771243239 is an equidigital number, since it uses as much as digits as its factorization.

647771243239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 55.

The spelling of 647771243239 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, two hundred thirty-nine".