66313391 has 2 divisors, whose sum is σ = 66313392. Its totient is φ = 66313390.

The previous prime is 66313369. The next prime is 66313397. The reversal of 66313391 is 19331366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66313391 - 2²² = 62119087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66313397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156695 + 33156696.

It is an arithmetic number, because the mean of its divisors is an integer number (33156696).

Almost surely, 2^66313391 is an apocalyptic number.

66313391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66313391 is an equidigital number, since it uses as much as digits as its factorization.

66313391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 32.

The square root of 66313391 is about 8143.3034451628. The cubic root of 66313391 is about 404.7626328434.

The spelling of 66313391 in words is "sixty-six million, three hundred thirteen thousand, three hundred ninety-one".