516216816837 has 12 divisors (see below), whose sum is σ = 745654291564. Its totient is φ = 344140954560.

The previous prime is 516216816833. The next prime is 516216816859. The reversal of 516216816837 is 738618612615.

It is a happy number.

516216816837 is a `hidden beast` number, since 5 + 1 + 621 + 6 + 8 + 1 + 6 + 8 + 3 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 447472696356 + 68744120481 = 668934^2 + 262191^2 .

It is not a de Polignac number, because 516216816837 - 2² = 516216816833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516216816833) 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, 839703 + ... + 1318155.

Almost surely, 2^516216816837 is an apocalyptic number.

It is an amenable number.

516216816837 is a deficient number, since it is larger than the sum of its proper divisors (229437474727).

516216816837 is a wasteful number, since it uses less digits than its factorization.

516216816837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598340 (or 598337 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 516216816837 in words is "five hundred sixteen billion, two hundred sixteen million, eight hundred sixteen thousand, eight hundred thirty-seven".