18546244957 has 4 divisors (see below), whose sum is σ = 18546771100. Its totient is φ = 18545718816.

The previous prime is 18546244919. The next prime is 18546244967. The reversal of 18546244957 is 75944264581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75944264581 = 23 ⋅3301924547.

It can be written as a sum of positive squares in 2 ways, for example, as 1376335801 + 17169909156 = 37099^2 + 131034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18546244957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18546244898 and 18546244907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18546244967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206082 + ... + 282067.

It is an arithmetic number, because the mean of its divisors is an integer number (4636692775).

Almost surely, 2^18546244957 is an apocalyptic number.

It is an amenable number.

18546244957 is a deficient number, since it is larger than the sum of its proper divisors (526143).

18546244957 is an equidigital number, since it uses as much as digits as its factorization.

18546244957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526142.

The product of its digits is 9676800, while the sum is 55.

It can be divided in two parts, 1854624 and 4957, that added together give a palindrome (1859581).

The spelling of 18546244957 in words is "eighteen billion, five hundred forty-six million, two hundred forty-four thousand, nine hundred fifty-seven".