18049471749 has 12 divisors (see below), whose sum is σ = 26086354476. Its totient is φ = 12026106432.

The previous prime is 18049471703. The next prime is 18049471793. The reversal of 18049471749 is 94717494081.

18049471749 is a `hidden beast` number, since 1 + 80 + 494 + 7 + 1 + 74 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6267888900 + 11781582849 = 79170^2 + 108543^2 .

It is not a de Polignac number, because 18049471749 - 2⁷ = 18049471621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18049471695 and 18049471704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18049491749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 556242 + ... + 587795.

It is an arithmetic number, because the mean of its divisors is an integer number (2173862873).

Almost surely, 2^18049471749 is an apocalyptic number.

It is an amenable number.

18049471749 is a deficient number, since it is larger than the sum of its proper divisors (8036882727).

18049471749 is a wasteful number, since it uses less digits than its factorization.

18049471749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145796 (or 1145793 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 18049471749 in words is "eighteen billion, forty-nine million, four hundred seventy-one thousand, seven hundred forty-nine".