646306102157 has 2 divisors, whose sum is σ = 646306102158. Its totient is φ = 646306102156.

The previous prime is 646306102097. The next prime is 646306102159. The reversal of 646306102157 is 751201603646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392319333316 + 253986768841 = 626354^2 + 503971^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646306102157 is a prime.

Together with 646306102159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646306102159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323153051078 + 323153051079.

It is an arithmetic number, because the mean of its divisors is an integer number (323153051079).

Almost surely, 2^646306102157 is an apocalyptic number.

It is an amenable number.

646306102157 is a deficient number, since it is larger than the sum of its proper divisors (1).

646306102157 is an equidigital number, since it uses as much as digits as its factorization.

646306102157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 646306102157 in words is "six hundred forty-six billion, three hundred six million, one hundred two thousand, one hundred fifty-seven".