66921301 has 2 divisors, whose sum is σ = 66921302. Its totient is φ = 66921300.

The previous prime is 66921269. The next prime is 66921317. The reversal of 66921301 is 10312966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33628401 + 33292900 = 5799^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 66921301 - 2⁵ = 66921269 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66921301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66921341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33460650 + 33460651.

It is an arithmetic number, because the mean of its divisors is an integer number (33460651).

Almost surely, 2^66921301 is an apocalyptic number.

It is an amenable number.

66921301 is a deficient number, since it is larger than the sum of its proper divisors (1).

66921301 is an equidigital number, since it uses as much as digits as its factorization.

66921301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 66921301 is about 8180.5440528121. The cubic root of 66921301 is about 405.9957229766.

The spelling of 66921301 in words is "sixty-six million, nine hundred twenty-one thousand, three hundred one".