666404145 has 64 divisors (see below), whose sum is σ = 1297831680. Its totient is φ = 321753600.

The previous prime is 666404113. The next prime is 666404149. The reversal of 666404145 is 541404666.

It is not a de Polignac number, because 666404145 - 2⁵ = 666404113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666404149) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 416487 + ... + 418083.

It is an arithmetic number, because the mean of its divisors is an integer number (20278620).

Almost surely, 2^666404145 is an apocalyptic number.

It is an amenable number.

666404145 is a deficient number, since it is larger than the sum of its proper divisors (631427535).

666404145 is a wasteful number, since it uses less digits than its factorization.

666404145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 666404145 is about 25814.8047639334. The cubic root of 666404145 is about 873.4657827819.

The spelling of 666404145 in words is "six hundred sixty-six million, four hundred four thousand, one hundred forty-five".