646663770007 has 2 divisors, whose sum is σ = 646663770008. Its totient is φ = 646663770006.

The previous prime is 646663769893. The next prime is 646663770017. The reversal of 646663770007 is 700077366646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646663770007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646663770017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323331885003 + 323331885004.

It is an arithmetic number, because the mean of its divisors is an integer number (323331885004).

Almost surely, 2^646663770007 is an apocalyptic number.

646663770007 is a deficient number, since it is larger than the sum of its proper divisors (1).

646663770007 is an equidigital number, since it uses as much as digits as its factorization.

646663770007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5334336, while the sum is 52.

The spelling of 646663770007 in words is "six hundred forty-six billion, six hundred sixty-three million, seven hundred seventy thousand, seven".