517666425 has 12 divisors (see below), whose sum is σ = 855875280. Its totient is φ = 276088720.

The previous prime is 517666421. The next prime is 517666459. The reversal of 517666425 is 524666715.

It is not a de Polignac number, because 517666425 - 2² = 517666421 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (517666421) 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, 3451035 + ... + 3451184.

It is an arithmetic number, because the mean of its divisors is an integer number (71322940).

Almost surely, 2^517666425 is an apocalyptic number.

It is an amenable number.

517666425 is a deficient number, since it is larger than the sum of its proper divisors (338208855).

517666425 is a wasteful number, since it uses less digits than its factorization.

517666425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902232 (or 6902227 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 517666425 is about 22752.2839512872. The cubic root of 517666425 is about 802.9404420302.

The spelling of 517666425 in words is "five hundred seventeen million, six hundred sixty-six thousand, four hundred twenty-five".