646601802617 has 2 divisors, whose sum is σ = 646601802618. Its totient is φ = 646601802616.

The previous prime is 646601802569. The next prime is 646601802629. The reversal of 646601802617 is 716208106646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443614609936 + 202987192681 = 666044^2 + 450541^2 .

It is a cyclic number.

It is not a de Polignac number, because 646601802617 - 2⁸ = 646601802361 is a prime.

It is a super-2 number, since 2×646601802617² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646601805617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323300901308 + 323300901309.

It is an arithmetic number, because the mean of its divisors is an integer number (323300901309).

Almost surely, 2^646601802617 is an apocalyptic number.

It is an amenable number.

646601802617 is a deficient number, since it is larger than the sum of its proper divisors (1).

646601802617 is an equidigital number, since it uses as much as digits as its factorization.

646601802617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 646601802617 in words is "six hundred forty-six billion, six hundred one million, eight hundred two thousand, six hundred seventeen".