647948311867 has 2 divisors, whose sum is σ = 647948311868. Its totient is φ = 647948311866.

The previous prime is 647948311819. The next prime is 647948311897. The reversal of 647948311867 is 768113849746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647948311867 - 2⁷ = 647948311739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647948311799 and 647948311808.

It is not a weakly prime, because it can be changed into another prime (647948311807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323974155933 + 323974155934.

It is an arithmetic number, because the mean of its divisors is an integer number (323974155934).

Almost surely, 2^647948311867 is an apocalyptic number.

647948311867 is a deficient number, since it is larger than the sum of its proper divisors (1).

647948311867 is an equidigital number, since it uses as much as digits as its factorization.

647948311867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48771072, while the sum is 64.

The spelling of 647948311867 in words is "six hundred forty-seven billion, nine hundred forty-eight million, three hundred eleven thousand, eight hundred sixty-seven".