18265712257 has 16 divisors (see below), whose sum is σ = 20451336192. Its totient is φ = 16203876480.

The previous prime is 18265712249. The next prime is 18265712261. The reversal of 18265712257 is 75221756281.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18265712257 - 2³ = 18265712249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18265712287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220033 + ... + 291454.

It is an arithmetic number, because the mean of its divisors is an integer number (1278208512).

Almost surely, 2^18265712257 is an apocalyptic number.

It is an amenable number.

18265712257 is a deficient number, since it is larger than the sum of its proper divisors (2185623935).

18265712257 is a wasteful number, since it uses less digits than its factorization.

18265712257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511608.

The product of its digits is 470400, while the sum is 46.

It can be divided in two parts, 1826571 and 2257, that added together give a triangular number (1828828 = T₁₉₁₂).

The spelling of 18265712257 in words is "eighteen billion, two hundred sixty-five million, seven hundred twelve thousand, two hundred fifty-seven".