647564643899 has 2 divisors, whose sum is σ = 647564643900. Its totient is φ = 647564643898.

The previous prime is 647564643853. The next prime is 647564643917. The reversal of 647564643899 is 998346465746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647564643899 - 2²⁰ = 647563595323 is a prime.

It is not a weakly prime, because it can be changed into another prime (647564643809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323782321949 + 323782321950.

It is an arithmetic number, because the mean of its divisors is an integer number (323782321950).

Almost surely, 2^647564643899 is an apocalyptic number.

647564643899 is a deficient number, since it is larger than the sum of its proper divisors (1).

647564643899 is an equidigital number, since it uses as much as digits as its factorization.

647564643899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940584960, while the sum is 71.

The spelling of 647564643899 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, eight hundred ninety-nine".