516642666562664 has 16 divisors (see below), whose sum is σ = 975775839221700. Its totient is φ = 256435776103552.

The previous prime is 516642666562619. The next prime is 516642666562669. The reversal of 516642666562664 is 466265666246615.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 472451522402500 + 44191144160164 = 21735950^2 + 6647642^2 .

It is a super-2 number, since 2×516642666562664² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (516642666562669) 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, 235694646059 + ... + 235694648250.

Almost surely, 2^{516642666562664} is an apocalyptic number.

It is an amenable number.

516642666562664 is a deficient number, since it is larger than the sum of its proper divisors (459133172659036).

516642666562664 is a wasteful number, since it uses less digits than its factorization.

516642666562664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471389294452 (or 471389294448 counting only the distinct ones).

The product of its digits is 2687385600, while the sum is 71.

The spelling of 516642666562664 in words is "five hundred sixteen trillion, six hundred forty-two billion, six hundred sixty-six million, five hundred sixty-two thousand, six hundred sixty-four".