18118261945 has 16 divisors (see below), whose sum is σ = 25376583168. Its totient is φ = 12159610560.

The previous prime is 18118261943. The next prime is 18118261949. The reversal of 18118261945 is 54916281181.

It is not a de Polignac number, because 18118261945 - 2¹ = 18118261943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18118261895 and 18118261904.

It is not an unprimeable number, because it can be changed into a prime (18118261943) 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, 5505426 + ... + 5508715.

It is an arithmetic number, because the mean of its divisors is an integer number (1586036448).

Almost surely, 2^18118261945 is an apocalyptic number.

It is an amenable number.

18118261945 is a deficient number, since it is larger than the sum of its proper divisors (7258321223).

18118261945 is a wasteful number, since it uses less digits than its factorization.

18118261945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11014200.

The product of its digits is 138240, while the sum is 46.

The spelling of 18118261945 in words is "eighteen billion, one hundred eighteen million, two hundred sixty-one thousand, nine hundred forty-five".