67071725921 has 2 divisors, whose sum is σ = 67071725922. Its totient is φ = 67071725920.

The previous prime is 67071725879. The next prime is 67071725923. The reversal of 67071725921 is 12952717076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63415830625 + 3655895296 = 251825^2 + 60464^2 .

It is a cyclic number.

It is not a de Polignac number, because 67071725921 - 2¹⁰ = 67071724897 is a prime.

Together with 67071725923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67071725923) 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, 33535862960 + 33535862961.

It is an arithmetic number, because the mean of its divisors is an integer number (33535862961).

Almost surely, 2^67071725921 is an apocalyptic number.

It is an amenable number.

67071725921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67071725921 is an equidigital number, since it uses as much as digits as its factorization.

67071725921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 47.

The spelling of 67071725921 in words is "sixty-seven billion, seventy-one million, seven hundred twenty-five thousand, nine hundred twenty-one".