18580205745 has 24 divisors (see below), whose sum is σ = 32210531496. Its totient is φ = 9907953408.

The previous prime is 18580205681. The next prime is 18580205747. The reversal of 18580205745 is 54750208581.

18580205745 is a `hidden beast` number, since 1 + 8 + 58 + 0 + 20 + 574 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 486996624 + 18093209121 = 22068^2 + 134511^2 .

It is not a de Polignac number, because 18580205745 - 2⁶ = 18580205681 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18580205745.

It is not an unprimeable number, because it can be changed into a prime (18580205747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313719 + ... + 368211.

It is an arithmetic number, because the mean of its divisors is an integer number (1342105479).

Almost surely, 2^18580205745 is an apocalyptic number.

18580205745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18580205745 is a deficient number, since it is larger than the sum of its proper divisors (13630325751).

18580205745 is a wasteful number, since it uses less digits than its factorization.

18580205745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62081 (or 62078 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 45.

The spelling of 18580205745 in words is "eighteen billion, five hundred eighty million, two hundred five thousand, seven hundred forty-five".