66425999 has 2 divisors, whose sum is σ = 66426000. Its totient is φ = 66425998.

The previous prime is 66425981. The next prime is 66426007. The reversal of 66425999 is 99952466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66425999 - 2¹² = 66421903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66425929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33212999 + 33213000.

It is an arithmetic number, because the mean of its divisors is an integer number (33213000).

Almost surely, 2^66425999 is an apocalyptic number.

66425999 is a deficient number, since it is larger than the sum of its proper divisors (1).

66425999 is an equidigital number, since it uses as much as digits as its factorization.

66425999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 66425999 is about 8150.2146597498. The cubic root of 66425999 is about 404.9916149257.

The spelling of 66425999 in words is "sixty-six million, four hundred twenty-five thousand, nine hundred ninety-nine".