18744952205 has 18 divisors (see below), whose sum is σ = 26169414894. Its totient is φ = 12852212016.

The previous prime is 18744952147. The next prime is 18744952207. The reversal of 18744952205 is 50225944781.

It can be written as a sum of positive squares in only one way, i.e., 14995961764 + 3748990441 = 122458^2 + 61229^2 .

It is not a de Polignac number, because 18744952205 - 2⁶ = 18744952141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18744952205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18744952207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2138642 + ... + 2147388.

It is an arithmetic number, because the mean of its divisors is an integer number (1453856383).

Almost surely, 2^18744952205 is an apocalyptic number.

It is an amenable number.

18744952205 is a deficient number, since it is larger than the sum of its proper divisors (7424462689).

18744952205 is an frugal number, since it uses more digits than its factorization.

18744952205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17513 (or 8759 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 18744952205 in words is "eighteen billion, seven hundred forty-four million, nine hundred fifty-two thousand, two hundred five".