666458397 has 12 divisors (see below), whose sum is σ = 1050177024. Its totient is φ = 403914120.

The previous prime is 666458389. The next prime is 666458407. The reversal of 666458397 is 793854666.

It is not a de Polignac number, because 666458397 - 2³ = 666458389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666458347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3365853 + ... + 3366050.

It is an arithmetic number, because the mean of its divisors is an integer number (87514752).

Almost surely, 2^666458397 is an apocalyptic number.

It is an amenable number.

666458397 is a deficient number, since it is larger than the sum of its proper divisors (383718627).

666458397 is a wasteful number, since it uses less digits than its factorization.

666458397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731920 (or 6731917 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 666458397 is about 25815.8555349227. The cubic root of 666458397 is about 873.4894851054.

The spelling of 666458397 in words is "six hundred sixty-six million, four hundred fifty-eight thousand, three hundred ninety-seven".