18125032217 has 8 divisors (see below), whose sum is σ = 18925246080. Its totient is φ = 17325832480.

The previous prime is 18125032213. The next prime is 18125032259. The reversal of 18125032217 is 71223052181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18125032217 - 2² = 18125032213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18125032213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216884 + ... + 288597.

It is an arithmetic number, because the mean of its divisors is an integer number (2365655760).

Almost surely, 2^18125032217 is an apocalyptic number.

It is an amenable number.

18125032217 is a deficient number, since it is larger than the sum of its proper divisors (800213863).

18125032217 is a wasteful number, since it uses less digits than its factorization.

18125032217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507063.

The product of its (nonzero) digits is 6720, while the sum is 32.

Adding to 18125032217 its reverse (71223052181), we get a palindrome (89348084398).

The spelling of 18125032217 in words is "eighteen billion, one hundred twenty-five million, thirty-two thousand, two hundred seventeen".