18506268257 has 8 divisors (see below), whose sum is σ = 19384320384. Its totient is φ = 17634335488.

The previous prime is 18506268239. The next prime is 18506268293. The reversal of 18506268257 is 75286260581.

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 18506268257 - 2¹⁴ = 18506251873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18506268457) 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, 1523648 + ... + 1535745.

It is an arithmetic number, because the mean of its divisors is an integer number (2423040048).

Almost surely, 2^18506268257 is an apocalyptic number.

It is an amenable number.

18506268257 is a deficient number, since it is larger than the sum of its proper divisors (878052127).

18506268257 is a wasteful number, since it uses less digits than its factorization.

18506268257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059679.

The product of its (nonzero) digits is 1612800, while the sum is 50.

The spelling of 18506268257 in words is "eighteen billion, five hundred six million, two hundred sixty-eight thousand, two hundred fifty-seven".