647616687943 has 2 divisors, whose sum is σ = 647616687944. Its totient is φ = 647616687942.

The previous prime is 647616687937. The next prime is 647616687961. The reversal of 647616687943 is 349786616746.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647616687943 is a prime.

It is a super-2 number, since 2×647616687943² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647616687983) 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, 323808343971 + 323808343972.

It is an arithmetic number, because the mean of its divisors is an integer number (323808343972).

Almost surely, 2^647616687943 is an apocalyptic number.

647616687943 is a deficient number, since it is larger than the sum of its proper divisors (1).

647616687943 is an equidigital number, since it uses as much as digits as its factorization.

647616687943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219469824, while the sum is 67.

The spelling of 647616687943 in words is "six hundred forty-seven billion, six hundred sixteen million, six hundred eighty-seven thousand, nine hundred forty-three".