647354931697 has 2 divisors, whose sum is σ = 647354931698. Its totient is φ = 647354931696.

The previous prime is 647354931689. The next prime is 647354931749. The reversal of 647354931697 is 796139453746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340094246976 + 307260684721 = 583176^2 + 554311^2 .

It is a cyclic number.

It is not a de Polignac number, because 647354931697 - 2³ = 647354931689 is a prime.

It is not a weakly prime, because it can be changed into another prime (647354931677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323677465848 + 323677465849.

It is an arithmetic number, because the mean of its divisors is an integer number (323677465849).

Almost surely, 2^647354931697 is an apocalyptic number.

It is an amenable number.

647354931697 is a deficient number, since it is larger than the sum of its proper divisors (1).

647354931697 is an equidigital number, since it uses as much as digits as its factorization.

647354931697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102876480, while the sum is 64.

The spelling of 647354931697 in words is "six hundred forty-seven billion, three hundred fifty-four million, nine hundred thirty-one thousand, six hundred ninety-seven".