18205957720336 has 45 divisors (see below), whose sum is σ = 35464173657381. Its totient is φ = 9054174698496.

The previous prime is 18205957720331. The next prime is 18205957720337. The reversal of 18205957720336 is 63302775950281.

It is a happy number.

The square root of 18205957720336 is 4266844.

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

It can be written as a sum of positive squares in only one way, i.e., 4411092067600 + 13794865652736 = 2100260^2 + 3714144^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18205957720331) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3294000805 + ... + 3294006331.

Almost surely, 2^{18205957720336} is an apocalyptic number.

18205957720336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18205957720336 is the 4266844-th square number.

It is an amenable number.

18205957720336 is a deficient number, since it is larger than the sum of its proper divisors (17258215937045).

18205957720336 is an frugal number, since it uses more digits than its factorization.

18205957720336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11448 (or 5722 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 18205957720336 in words is "eighteen trillion, two hundred five billion, nine hundred fifty-seven million, seven hundred twenty thousand, three hundred thirty-six".