516217666 has 32 divisors (see below), whose sum is σ = 809347968. Its totient is φ = 246758400.

The previous prime is 516217651. The next prime is 516217703. The reversal of 516217666 is 666712615.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894370 + ... + 894946.

It is an arithmetic number, because the mean of its divisors is an integer number (25292124).

Almost surely, 2^516217666 is an apocalyptic number.

516217666 is a deficient number, since it is larger than the sum of its proper divisors (293130302).

516217666 is a wasteful number, since it uses less digits than its factorization.

516217666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 90720, while the sum is 40.

The square root of 516217666 is about 22720.4239837200. The cubic root of 516217666 is about 802.1906966263.

The spelling of 516217666 in words is "five hundred sixteen million, two hundred seventeen thousand, six hundred sixty-six".