647607736871 has 2 divisors, whose sum is σ = 647607736872. Its totient is φ = 647607736870.

The previous prime is 647607736781. The next prime is 647607736883. The reversal of 647607736871 is 178637706746.

Together with previous prime (647607736781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647607736871 - 2¹⁰ = 647607735847 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647607736771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323803868435 + 323803868436.

It is an arithmetic number, because the mean of its divisors is an integer number (323803868436).

Almost surely, 2^647607736871 is an apocalyptic number.

647607736871 is a deficient number, since it is larger than the sum of its proper divisors (1).

647607736871 is an equidigital number, since it uses as much as digits as its factorization.

647607736871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49787136, while the sum is 62.

The spelling of 647607736871 in words is "six hundred forty-seven billion, six hundred seven million, seven hundred thirty-six thousand, eight hundred seventy-one".