18109525437 has 6 divisors (see below), whose sum is σ = 26158203422. Its totient is φ = 12073016952.

The previous prime is 18109525403. The next prime is 18109525457. The reversal of 18109525437 is 73452590181.

18109525437 is a `hidden beast` number, since 1 + 8 + 10 + 95 + 2 + 543 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18109354041 + 171396 = 134571^2 + 414^2 .

It is not a de Polignac number, because 18109525437 - 2⁶ = 18109525373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18109525392 and 18109525401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109525457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1006084738 + ... + 1006084755.

Almost surely, 2^18109525437 is an apocalyptic number.

It is an amenable number.

18109525437 is a deficient number, since it is larger than the sum of its proper divisors (8048677985).

18109525437 is a wasteful number, since it uses less digits than its factorization.

18109525437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012169499 (or 2012169496 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 18109525437 in words is "eighteen billion, one hundred nine million, five hundred twenty-five thousand, four hundred thirty-seven".