666339497 has 12 divisors (see below), whose sum is σ = 708963696. Its totient is φ = 626149440.

The previous prime is 666339469. The next prime is 666339511. The reversal of 666339497 is 794933666.

It is not a de Polignac number, because 666339497 - 2⁶ = 666339433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666339197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232958 + ... + 235800.

It is an arithmetic number, because the mean of its divisors is an integer number (59080308).

Almost surely, 2^666339497 is an apocalyptic number.

It is an amenable number.

666339497 is a deficient number, since it is larger than the sum of its proper divisors (42624199).

666339497 is a wasteful number, since it uses less digits than its factorization.

666339497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688 (or 3671 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 53.

The square root of 666339497 is about 25813.5525838657. The cubic root of 666339497 is about 873.4375368382.

The spelling of 666339497 in words is "six hundred sixty-six million, three hundred thirty-nine thousand, four hundred ninety-seven".