516165681 has 16 divisors (see below), whose sum is σ = 692778240. Its totient is φ = 341840400.

The previous prime is 516165677. The next prime is 516165691. The reversal of 516165681 is 186561615.

It is not a de Polignac number, because 516165681 - 2² = 516165677 is a prime.

It is a super-2 number, since 2×516165681² = 532854020484387522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (516165631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 355006 + ... + 356456.

It is an arithmetic number, because the mean of its divisors is an integer number (43298640).

Almost surely, 2^516165681 is an apocalyptic number.

It is an amenable number.

516165681 is a deficient number, since it is larger than the sum of its proper divisors (176612559).

516165681 is a wasteful number, since it uses less digits than its factorization.

516165681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2156.

The product of its digits is 43200, while the sum is 39.

The square root of 516165681 is about 22719.2799401742. The cubic root of 516165681 is about 802.1637678802.

The spelling of 516165681 in words is "five hundred sixteen million, one hundred sixty-five thousand, six hundred eighty-one".