647175427693 has 2 divisors, whose sum is σ = 647175427694. Its totient is φ = 647175427692.

The previous prime is 647175427621. The next prime is 647175427709. The reversal of 647175427693 is 396724571746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397482333444 + 249693094249 = 630462^2 + 499693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647175427693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647175427193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323587713846 + 323587713847.

It is an arithmetic number, because the mean of its divisors is an integer number (323587713847).

Almost surely, 2^647175427693 is an apocalyptic number.

It is an amenable number.

647175427693 is a deficient number, since it is larger than the sum of its proper divisors (1).

647175427693 is an equidigital number, since it uses as much as digits as its factorization.

647175427693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 61.

The spelling of 647175427693 in words is "six hundred forty-seven billion, one hundred seventy-five million, four hundred twenty-seven thousand, six hundred ninety-three".