5572636821 has 6 divisors (see below), whose sum is σ = 8049364310. Its totient is φ = 3715091208.

The previous prime is 5572636777. The next prime is 5572636829. The reversal of 5572636821 is 1286362755.

5572636821 is a `hidden beast` number, since 5 + 5 + 7 + 2 + 636 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5541164721 + 31472100 = 74439^2 + 5610^2 .

It is not a de Polignac number, because 5572636821 - 2⁹ = 5572636309 is a prime.

It is a super-2 number, since 2×5572636821² = 62108562277529972082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5572636829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 309590926 + ... + 309590943.

Almost surely, 2^5572636821 is an apocalyptic number.

It is an amenable number.

5572636821 is a deficient number, since it is larger than the sum of its proper divisors (2476727489).

5572636821 is a wasteful number, since it uses less digits than its factorization.

5572636821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619181875 (or 619181872 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 5572636821 is about 74650.0959209029. The cubic root of 5572636821 is about 1772.9109134762.

The spelling of 5572636821 in words is "five billion, five hundred seventy-two million, six hundred thirty-six thousand, eight hundred twenty-one".