67717921673 has 2 divisors, whose sum is σ = 67717921674. Its totient is φ = 67717921672.

The previous prime is 67717921651. The next prime is 67717921693. The reversal of 67717921673 is 37612971776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62142014089 + 5575907584 = 249283^2 + 74672^2 .

It is a cyclic number.

It is not a de Polignac number, because 67717921673 - 2⁸ = 67717921417 is a prime.

It is not a weakly prime, because it can be changed into another prime (67717921613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33858960836 + 33858960837.

It is an arithmetic number, because the mean of its divisors is an integer number (33858960837).

Almost surely, 2^67717921673 is an apocalyptic number.

It is an amenable number.

67717921673 is a deficient number, since it is larger than the sum of its proper divisors (1).

67717921673 is an equidigital number, since it uses as much as digits as its factorization.

67717921673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4667544, while the sum is 56.

The spelling of 67717921673 in words is "sixty-seven billion, seven hundred seventeen million, nine hundred twenty-one thousand, six hundred seventy-three".