647663543 has 2 divisors, whose sum is σ = 647663544. Its totient is φ = 647663542.

The previous prime is 647663539. The next prime is 647663561. The reversal of 647663543 is 345366746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647663543 - 2² = 647663539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647663494 and 647663503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647668543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323831771 + 323831772.

It is an arithmetic number, because the mean of its divisors is an integer number (323831772).

Almost surely, 2^647663543 is an apocalyptic number.

647663543 is a deficient number, since it is larger than the sum of its proper divisors (1).

647663543 is an equidigital number, since it uses as much as digits as its factorization.

647663543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 44.

The square root of 647663543 is about 25449.2346250334. The cubic root of 647663543 is about 865.1999462051.

The spelling of 647663543 in words is "six hundred forty-seven million, six hundred sixty-three thousand, five hundred forty-three".