67066235021 has 2 divisors, whose sum is σ = 67066235022. Its totient is φ = 67066235020.

The previous prime is 67066235009. The next prime is 67066235051. The reversal of 67066235021 is 12053266076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66866719396 + 199515625 = 258586^2 + 14125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67066235021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67066235051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33533117510 + 33533117511.

It is an arithmetic number, because the mean of its divisors is an integer number (33533117511).

Almost surely, 2^67066235021 is an apocalyptic number.

It is an amenable number.

67066235021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67066235021 is an equidigital number, since it uses as much as digits as its factorization.

67066235021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 67066235021 in words is "sixty-seven billion, sixty-six million, two hundred thirty-five thousand, twenty-one".