18844781522 has 42 divisors (see below), whose sum is σ = 33095270583. Its totient is φ = 8047796652.

The previous prime is 18844781513. The next prime is 18844781539. The reversal of 18844781522 is 22518744881.

It can be written as a sum of positive squares in only one way, i.e., 9422390761 + 9422390761 = 97069^2 + 97069^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=97069.

It is a super-2 number, since 2×18844781522² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 20 ways as a sum of consecutive naturals, for example, 66589193 + ... + 66589475.

Almost surely, 2^18844781522 is an apocalyptic number.

18844781522 is a deficient number, since it is larger than the sum of its proper divisors (14250489061).

18844781522 is an frugal number, since it uses more digits than its factorization.

18844781522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 292 counting only the distinct ones).

The product of its digits is 1146880, while the sum is 50.

Multiplying 18844781522 by its sum of digits (50), we get a square (942239076100 = 970690²).

The spelling of 18844781522 in words is "eighteen billion, eight hundred forty-four million, seven hundred eighty-one thousand, five hundred twenty-two".