66290407 has 2 divisors, whose sum is σ = 66290408. Its totient is φ = 66290406.

The previous prime is 66290381. The next prime is 66290423. The reversal of 66290407 is 70409266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66290407 - 2¹⁹ = 65766119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66290437) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33145203 + 33145204.

It is an arithmetic number, because the mean of its divisors is an integer number (33145204).

Almost surely, 2^66290407 is an apocalyptic number.

66290407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66290407 is an equidigital number, since it uses as much as digits as its factorization.

66290407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 66290407 is about 8141.8921019625. The cubic root of 66290407 is about 404.7158643138.

The spelling of 66290407 in words is "sixty-six million, two hundred ninety thousand, four hundred seven".