5812821666 has 12 divisors (see below), whose sum is σ = 12594446982. Its totient is φ = 1937607216.

The previous prime is 5812821661. The next prime is 5812821689. The reversal of 5812821666 is 6661282185.

It can be written as a sum of positive squares in only one way, i.e., 3384796041 + 2428025625 = 58179^2 + 49275^2 .

It is not an unprimeable number, because it can be changed into a prime (5812821661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 161467251 + ... + 161467286.

Almost surely, 2^5812821666 is an apocalyptic number.

5812821666 is an abundant number, since it is smaller than the sum of its proper divisors (6781625316).

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

5812821666 is a wasteful number, since it uses less digits than its factorization.

5812821666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322934545 (or 322934542 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 5812821666 is about 76241.8629494322. The cubic root of 5812821666 is about 1798.0247536086.

The spelling of 5812821666 in words is "five billion, eight hundred twelve million, eight hundred twenty-one thousand, six hundred sixty-six".