516161402221 has 16 divisors (see below), whose sum is σ = 520198848000. Its totient is φ = 512143235968.

The previous prime is 516161402173. The next prime is 516161402243. The reversal of 516161402221 is 122204161615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 516161402221 - 2¹⁷ = 516161271149 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 (516161402321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79737441 + ... + 79743913.

It is an arithmetic number, because the mean of its divisors is an integer number (32512428000).

Almost surely, 2^516161402221 is an apocalyptic number.

It is an amenable number.

516161402221 is a deficient number, since it is larger than the sum of its proper divisors (4037445779).

516161402221 is a wasteful number, since it uses less digits than its factorization.

516161402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7868.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 516161402221 its reverse (122204161615), we get a palindrome (638365563836).

The spelling of 516161402221 in words is "five hundred sixteen billion, one hundred sixty-one million, four hundred two thousand, two hundred twenty-one".