18205428635524 has 81 divisors (see below), whose sum is σ = 34670083588623. Its totient is φ = 8360981201664.

The previous prime is 18205428635507. The next prime is 18205428635531. The reversal of 18205428635524 is 42553682450281.

It is a happy number.

The square root of 18205428635524 is 4266782.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9995828377924 + 8209600257600 = 3161618^2 + 2865240^2 .

It is a Duffinian 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 26 ways as a sum of consecutive naturals, for example, 42044869612 + ... + 42044870044.

Almost surely, 2^{18205428635524} is an apocalyptic number.

18205428635524 is the 4266782-nd square number.

It is an amenable number.

18205428635524 is a deficient number, since it is larger than the sum of its proper divisors (16464654953099).

18205428635524 is an frugal number, since it uses more digits than its factorization.

18205428635524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 18432000, while the sum is 55.

The spelling of 18205428635524 in words is "eighteen trillion, two hundred five billion, four hundred twenty-eight million, six hundred thirty-five thousand, five hundred twenty-four".