66408907 has 2 divisors, whose sum is σ = 66408908. Its totient is φ = 66408906.

The previous prime is 66408893. The next prime is 66408917. The reversal of 66408907 is 70980466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66408907 - 2²³ = 58020299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66408907.

It is not a weakly prime, because it can be changed into another prime (66408917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33204453 + 33204454.

It is an arithmetic number, because the mean of its divisors is an integer number (33204454).

Almost surely, 2^66408907 is an apocalyptic number.

66408907 is a deficient number, since it is larger than the sum of its proper divisors (1).

66408907 is an equidigital number, since it uses as much as digits as its factorization.

66408907 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 40.

The square root of 66408907 is about 8149.1660309507. The cubic root of 66408907 is about 404.9568759652.

The spelling of 66408907 in words is "sixty-six million, four hundred eight thousand, nine hundred seven".