18516841757 has 4 divisors (see below), whose sum is σ = 18739936320. Its totient is φ = 18293747196.

The previous prime is 18516841751. The next prime is 18516841781. The reversal of 18516841757 is 75714861581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75714861581 = 41 ⋅1846703941.

It is a cyclic number.

It is not a de Polignac number, because 18516841757 - 2⁸ = 18516841501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18516841699 and 18516841708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18516841751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111547157 + ... + 111547322.

It is an arithmetic number, because the mean of its divisors is an integer number (4684984080).

Almost surely, 2^18516841757 is an apocalyptic number.

It is an amenable number.

18516841757 is a deficient number, since it is larger than the sum of its proper divisors (223094563).

18516841757 is an equidigital number, since it uses as much as digits as its factorization.

18516841757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223094562.

The product of its digits is 1881600, while the sum is 53.

The spelling of 18516841757 in words is "eighteen billion, five hundred sixteen million, eight hundred forty-one thousand, seven hundred fifty-seven".