66343807 has 2 divisors, whose sum is σ = 66343808. Its totient is φ = 66343806.

The previous prime is 66343777. The next prime is 66343811. The reversal of 66343807 is 70834366.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66343807 - 2¹⁹ = 65819519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66343847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33171903 + 33171904.

It is an arithmetic number, because the mean of its divisors is an integer number (33171904).

Almost surely, 2^66343807 is an apocalyptic number.

66343807 is a deficient number, since it is larger than the sum of its proper divisors (1).

66343807 is an equidigital number, since it uses as much as digits as its factorization.

66343807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 66343807 is about 8145.1707778290. The cubic root of 66343807 is about 404.8245076185.

The spelling of 66343807 in words is "sixty-six million, three hundred forty-three thousand, eight hundred seven".