67145056309 has 2 divisors, whose sum is σ = 67145056310. Its totient is φ = 67145056308.

The previous prime is 67145056271. The next prime is 67145056313. The reversal of 67145056309 is 90365054176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63451091025 + 3693965284 = 251895^2 + 60778^2 .

It is a cyclic number.

It is not a de Polignac number, because 67145056309 - 2¹¹ = 67145054261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67145056339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33572528154 + 33572528155.

It is an arithmetic number, because the mean of its divisors is an integer number (33572528155).

Almost surely, 2^67145056309 is an apocalyptic number.

It is an amenable number.

67145056309 is a deficient number, since it is larger than the sum of its proper divisors (1).

67145056309 is an equidigital number, since it uses as much as digits as its factorization.

67145056309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 67145056309 in words is "sixty-seven billion, one hundred forty-five million, fifty-six thousand, three hundred nine".