647663747 has 2 divisors, whose sum is σ = 647663748. Its totient is φ = 647663746.

The previous prime is 647663683. The next prime is 647663759. The reversal of 647663747 is 747366746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647663747 - 2⁶ = 647663683 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 647663695 and 647663704.

It is not a weakly prime, because it can be changed into another prime (647663147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323831873 + 323831874.

It is an arithmetic number, because the mean of its divisors is an integer number (323831874).

Almost surely, 2^647663747 is an apocalyptic number.

647663747 is a deficient number, since it is larger than the sum of its proper divisors (1).

647663747 is an equidigital number, since it uses as much as digits as its factorization.

647663747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 50.

The square root of 647663747 is about 25449.2386330122. The cubic root of 647663747 is about 865.2000370448.

The spelling of 647663747 in words is "six hundred forty-seven million, six hundred sixty-three thousand, seven hundred forty-seven".