66575407 has 2 divisors, whose sum is σ = 66575408. Its totient is φ = 66575406.

The previous prime is 66575371. The next prime is 66575429. The reversal of 66575407 is 70457566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66575407 - 2⁷ = 66575279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66575407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66575477) 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, 33287703 + 33287704.

It is an arithmetic number, because the mean of its divisors is an integer number (33287704).

Almost surely, 2^66575407 is an apocalyptic number.

66575407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66575407 is an equidigital number, since it uses as much as digits as its factorization.

66575407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 66575407 is about 8159.3754050172. The cubic root of 66575407 is about 405.2950286408.

The spelling of 66575407 in words is "sixty-six million, five hundred seventy-five thousand, four hundred seven".