66394351 has 2 divisors, whose sum is σ = 66394352. Its totient is φ = 66394350.

The previous prime is 66394309. The next prime is 66394397. The reversal of 66394351 is 15349366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66394351 - 2⁹ = 66393839 is a prime.

It is a super-2 number, since 2×66394351² = 8816419689422402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66394351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66394651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33197175 + 33197176.

It is an arithmetic number, because the mean of its divisors is an integer number (33197176).

Almost surely, 2^66394351 is an apocalyptic number.

66394351 is a deficient number, since it is larger than the sum of its proper divisors (1).

66394351 is an equidigital number, since it uses as much as digits as its factorization.

66394351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 37.

The square root of 66394351 is about 8148.2728844829. The cubic root of 66394351 is about 404.9272866461.

The spelling of 66394351 in words is "sixty-six million, three hundred ninety-four thousand, three hundred fifty-one".