66129373 has 2 divisors, whose sum is σ = 66129374. Its totient is φ = 66129372.

The previous prime is 66129289. The next prime is 66129379. The reversal of 66129373 is 37392166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 1776889 = 8022^2 + 1333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66129373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66129379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064686 + 33064687.

It is an arithmetic number, because the mean of its divisors is an integer number (33064687).

Almost surely, 2^66129373 is an apocalyptic number.

It is an amenable number.

66129373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66129373 is an equidigital number, since it uses as much as digits as its factorization.

66129373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 37.

The square root of 66129373 is about 8131.9968642394. The cubic root of 66129373 is about 404.3878839318.

The spelling of 66129373 in words is "sixty-six million, one hundred twenty-nine thousand, three hundred seventy-three".