67316621 has 2 divisors, whose sum is σ = 67316622. Its totient is φ = 67316620.

The previous prime is 67316609. The next prime is 67316647. The reversal of 67316621 is 12661376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36735721 + 30580900 = 6061^2 + 5530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67316621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67316321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33658310 + 33658311.

It is an arithmetic number, because the mean of its divisors is an integer number (33658311).

Almost surely, 2^67316621 is an apocalyptic number.

It is an amenable number.

67316621 is a deficient number, since it is larger than the sum of its proper divisors (1).

67316621 is an equidigital number, since it uses as much as digits as its factorization.

67316621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 67316621 is about 8204.6706819957. The cubic root of 67316621 is about 406.7935916482.

Adding to 67316621 its reverse (12661376), we get a palindrome (79977997).

The spelling of 67316621 in words is "sixty-seven million, three hundred sixteen thousand, six hundred twenty-one".