18205492747 has 4 divisors (see below), whose sum is σ = 19605915280. Its totient is φ = 16805070216.

The previous prime is 18205492733. The next prime is 18205492757. The reversal of 18205492747 is 74729450281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74729450281 = 107137 ⋅697513.

It is a cyclic number.

It is not a de Polignac number, because 18205492747 - 2¹⁹ = 18204968459 is a prime.

It is a super-2 number, since 2×18205492747² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18205492747.

It is not an unprimeable number, because it can be changed into a prime (18205492757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700211247 + ... + 700211272.

It is an arithmetic number, because the mean of its divisors is an integer number (4901478820).

Almost surely, 2^18205492747 is an apocalyptic number.

18205492747 is a deficient number, since it is larger than the sum of its proper divisors (1400422533).

18205492747 is a wasteful number, since it uses less digits than its factorization.

18205492747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400422532.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 18205492747 in words is "eighteen billion, two hundred five million, four hundred ninety-two thousand, seven hundred forty-seven".