516780805 has 4 divisors (see below), whose sum is σ = 620136972. Its totient is φ = 413424640.

The previous prime is 516780787. The next prime is 516780809. The reversal of 516780805 is 508087615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68442529 + 448338276 = 8273^2 + 21174^2 .

It is not a de Polignac number, because 516780805 - 2²³ = 508392197 is a prime.

It is a super-3 number, since 3×516780805³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516780809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51678076 + ... + 51678085.

It is an arithmetic number, because the mean of its divisors is an integer number (155034243).

Almost surely, 2^516780805 is an apocalyptic number.

It is an amenable number.

516780805 is a deficient number, since it is larger than the sum of its proper divisors (103356167).

516780805 is a wasteful number, since it uses less digits than its factorization.

516780805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103356166.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 516780805 is about 22732.8133982576. The cubic root of 516780805 is about 802.4822924183.

The spelling of 516780805 in words is "five hundred sixteen million, seven hundred eighty thousand, eight hundred five".