5716521666 has 24 divisors (see below), whose sum is σ = 12391143804. Its totient is φ = 1904684640.

The previous prime is 5716521653. The next prime is 5716521667. The reversal of 5716521666 is 6661256175.

It can be written as a sum of positive squares in 2 ways, for example, as 4185443025 + 1531078641 = 64695^2 + 39129^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5716521667) 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, 24945 + ... + 109796.

Almost surely, 2^5716521666 is an apocalyptic number.

5716521666 is an abundant number, since it is smaller than the sum of its proper divisors (6674622138).

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

5716521666 is a wasteful number, since it uses less digits than its factorization.

5716521666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137106 (or 137103 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 5716521666 is about 75607.6825858325. The cubic root of 5716521666 is about 1788.0402243852.

The spelling of 5716521666 in words is "five billion, seven hundred sixteen million, five hundred twenty-one thousand, six hundred sixty-six".