1516563666 has 24 divisors (see below), whose sum is σ = 3291685020. Its totient is φ = 504629376.

The previous prime is 1516563623. The next prime is 1516563667. The reversal of 1516563666 is 6663656151.

It can be written as a sum of positive squares in 2 ways, for example, as 1243620225 + 272943441 = 35265^2 + 16521^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1516563667) 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, 63795 + ... + 84278.

Almost surely, 2^1516563666 is an apocalyptic number.

1516563666 is an abundant number, since it is smaller than the sum of its proper divisors (1775121354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1516563666 is a wasteful number, since it uses less digits than its factorization.

1516563666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148650 (or 148647 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 1516563666 is about 38943.0823895593. The cubic root of 1516563666 is about 1148.9123089323.

The spelling of 1516563666 in words is "one billion, five hundred sixteen million, five hundred sixty-three thousand, six hundred sixty-six".