67576755316921 has 2 divisors, whose sum is σ = 67576755316922. Its totient is φ = 67576755316920.

The previous prime is 67576755316919. The next prime is 67576755316943. The reversal of 67576755316921 is 12961355767576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57939331780521 + 9637423536400 = 7611789^2 + 3104420^2 .

It is a cyclic number.

It is not a de Polignac number, because 67576755316921 - 2¹ = 67576755316919 is a prime.

Together with 67576755316919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (67576755316951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33788377658460 + 33788377658461.

It is an arithmetic number, because the mean of its divisors is an integer number (33788377658461).

Almost surely, 2^{67576755316921} is an apocalyptic number.

It is an amenable number.

67576755316921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67576755316921 is an equidigital number, since it uses as much as digits as its factorization.

67576755316921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500094000, while the sum is 70.

The spelling of 67576755316921 in words is "sixty-seven trillion, five hundred seventy-six billion, seven hundred fifty-five million, three hundred sixteen thousand, nine hundred twenty-one".