18540115785 has 16 divisors (see below), whose sum is σ = 32960206080. Its totient is φ = 9888061680.

The previous prime is 18540115757. The next prime is 18540115817. The reversal of 18540115785 is 58751104581.

18540115785 is a `hidden beast` number, since 18 + 5 + 401 + 157 + 85 = 666.

It is not a de Polignac number, because 18540115785 - 2¹⁴ = 18540099401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18540115785.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68666961 + ... + 68667230.

It is an arithmetic number, because the mean of its divisors is an integer number (2060012880).

Almost surely, 2^18540115785 is an apocalyptic number.

18540115785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18540115785 is a deficient number, since it is larger than the sum of its proper divisors (14420090295).

18540115785 is a wasteful number, since it uses less digits than its factorization.

18540115785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137334205 (or 137334199 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 45.

The spelling of 18540115785 in words is "eighteen billion, five hundred forty million, one hundred fifteen thousand, seven hundred eighty-five".