647616687937 has 2 divisors, whose sum is σ = 647616687938. Its totient is φ = 647616687936.

The previous prime is 647616687881. The next prime is 647616687943. The reversal of 647616687937 is 739786616746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 623406572721 + 24210115216 = 789561^2 + 155596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647616687937 is a prime.

It is not a weakly prime, because it can be changed into another prime (647616687037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323808343968 + 323808343969.

It is an arithmetic number, because the mean of its divisors is an integer number (323808343969).

Almost surely, 2^647616687937 is an apocalyptic number.

It is an amenable number.

647616687937 is a deficient number, since it is larger than the sum of its proper divisors (1).

647616687937 is an equidigital number, since it uses as much as digits as its factorization.

647616687937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384072192, while the sum is 70.

The spelling of 647616687937 in words is "six hundred forty-seven billion, six hundred sixteen million, six hundred eighty-seven thousand, nine hundred thirty-seven".