647663579 has 2 divisors, whose sum is σ = 647663580. Its totient is φ = 647663578.

The previous prime is 647663561. The next prime is 647663587. The reversal of 647663579 is 975366746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647663579 - 2⁸ = 647663323 is a prime.

It is a super-2 number, since 2×647663579² = 838936223126178482, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647663579.

It is not a weakly prime, because it can be changed into another prime (647663539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323831789 + 323831790.

It is an arithmetic number, because the mean of its divisors is an integer number (323831790).

Almost surely, 2^647663579 is an apocalyptic number.

647663579 is a deficient number, since it is larger than the sum of its proper divisors (1).

647663579 is an equidigital number, since it uses as much as digits as its factorization.

647663579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 53.

The square root of 647663579 is about 25449.2353323238. The cubic root of 647663579 is about 865.1999622356.

The spelling of 647663579 in words is "six hundred forty-seven million, six hundred sixty-three thousand, five hundred seventy-nine".