647771243573 has 2 divisors, whose sum is σ = 647771243574. Its totient is φ = 647771243572.

The previous prime is 647771243443. The next prime is 647771243611. The reversal of 647771243573 is 375342177746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641251811524 + 6519432049 = 800782^2 + 80743^2 .

It is a cyclic number.

It is not a de Polignac number, because 647771243573 - 2¹² = 647771239477 is a prime.

It is a super-2 number, since 2×647771243573² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain 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 (647776243573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323885621786 + 323885621787.

It is an arithmetic number, because the mean of its divisors is an integer number (323885621787).

Almost surely, 2^647771243573 is an apocalyptic number.

It is an amenable number.

647771243573 is a deficient number, since it is larger than the sum of its proper divisors (1).

647771243573 is an equidigital number, since it uses as much as digits as its factorization.

647771243573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20744640, while the sum is 56.

The spelling of 647771243573 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, five hundred seventy-three".