5618977821 has 12 divisors (see below), whose sum is σ = 8137721280. Its totient is φ = 3736099080.

The previous prime is 5618977813. The next prime is 5618977823. The reversal of 5618977821 is 1287798165.

5618977821 is a `hidden beast` number, since 561 + 8 + 9 + 7 + 78 + 2 + 1 = 666.

It is not a de Polignac number, because 5618977821 - 2³ = 5618977813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5618977823) 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, 820245 + ... + 827066.

It is an arithmetic number, because the mean of its divisors is an integer number (678143440).

Almost surely, 2^5618977821 is an apocalyptic number.

It is an amenable number.

5618977821 is a deficient number, since it is larger than the sum of its proper divisors (2518743459).

5618977821 is a wasteful number, since it uses less digits than its factorization.

5618977821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647696 (or 1647693 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 5618977821 is about 74959.8413885729. The cubic root of 5618977821 is about 1777.8117515945.

The spelling of 5618977821 in words is "five billion, six hundred eighteen million, nine hundred seventy-seven thousand, eight hundred twenty-one".