67146922721 has 2 divisors, whose sum is σ = 67146922722. Its totient is φ = 67146922720.

The previous prime is 67146922709. The next prime is 67146922769. The reversal of 67146922721 is 12722964176.

67146922721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62945290321 + 4201632400 = 250889^2 + 64820^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67146922721 is a prime.

It is not a weakly prime, because it can be changed into another prime (67146922121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33573461360 + 33573461361.

It is an arithmetic number, because the mean of its divisors is an integer number (33573461361).

Almost surely, 2^67146922721 is an apocalyptic number.

It is an amenable number.

67146922721 is a deficient number, since it is larger than the sum of its proper divisors (1).

67146922721 is an equidigital number, since it uses as much as digits as its factorization.

67146922721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The spelling of 67146922721 in words is "sixty-seven billion, one hundred forty-six million, nine hundred twenty-two thousand, seven hundred twenty-one".