18821827572 has 48 divisors (see below), whose sum is σ = 44141258112. Its totient is φ = 6242060160.

The previous prime is 18821827547. The next prime is 18821827621. The reversal of 18821827572 is 27572812881.

It is a happy number.

It is a super-2 number, since 2×18821827572² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2465922 + ... + 2473542.

It is an arithmetic number, because the mean of its divisors is an integer number (919609544).

Almost surely, 2^18821827572 is an apocalyptic number.

18821827572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18821827572 is an abundant number, since it is smaller than the sum of its proper divisors (25319430540).

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

18821827572 is a wasteful number, since it uses less digits than its factorization.

18821827572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8648 (or 8646 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 51.

The spelling of 18821827572 in words is "eighteen billion, eight hundred twenty-one million, eight hundred twenty-seven thousand, five hundred seventy-two".