18186272237 has 24 divisors (see below), whose sum is σ = 22298099040. Its totient is φ = 14748441120.

The previous prime is 18186272213. The next prime is 18186272303. The reversal of 18186272237 is 73227268181.

It is a de Polignac number, because none of the positive numbers 2^k-18186272237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18186272191 and 18186272200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18186272837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 720287 + ... + 745107.

It is an arithmetic number, because the mean of its divisors is an integer number (929087460).

Almost surely, 2^18186272237 is an apocalyptic number.

It is an amenable number.

18186272237 is a deficient number, since it is larger than the sum of its proper divisors (4111826803).

18186272237 is a wasteful number, since it uses less digits than its factorization.

18186272237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25641 (or 25634 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The spelling of 18186272237 in words is "eighteen billion, one hundred eighty-six million, two hundred seventy-two thousand, two hundred thirty-seven".