516866668615 has 32 divisors (see below), whose sum is σ = 678033354240. Its totient is φ = 375121756800.

The previous prime is 516866668607. The next prime is 516866668631.

516866668615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 516866668615 - 2³ = 516866668607 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56850220 + ... + 56859310.

It is an arithmetic number, because the mean of its divisors is an integer number (21188542320).

Almost surely, 2^516866668615 is an apocalyptic number.

516866668615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

516866668615 is a deficient number, since it is larger than the sum of its proper divisors (161166685625).

516866668615 is a wasteful number, since it uses less digits than its factorization.

516866668615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11143.

The product of its digits is 74649600, while the sum is 64.

The spelling of 516866668615 in words is "five hundred sixteen billion, eight hundred sixty-six million, six hundred sixty-eight thousand, six hundred fifteen".