18621828356 has 48 divisors (see below), whose sum is σ = 35240338224. Its totient is φ = 8577294336.

The previous prime is 18621828343. The next prime is 18621828361. The reversal of 18621828356 is 65382812681.

It can be written as a sum of positive squares in 8 ways, for example, as 968454400 + 17653373956 = 31120^2 + 132866^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1554566 + ... + 1566498.

It is an arithmetic number, because the mean of its divisors is an integer number (734173713).

Almost surely, 2^18621828356 is an apocalyptic number.

It is an amenable number.

18621828356 is a deficient number, since it is larger than the sum of its proper divisors (16618509868).

18621828356 is a wasteful number, since it uses less digits than its factorization.

18621828356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12440 (or 12438 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 50.

The spelling of 18621828356 in words is "eighteen billion, six hundred twenty-one million, eight hundred twenty-eight thousand, three hundred fifty-six".