18850740805 has 24 divisors (see below), whose sum is σ = 25339490280. Its totient is φ = 13440510720.

The previous prime is 18850740791. The next prime is 18850740823. The reversal of 18850740805 is 50804705881.

It is a Cunningham number, because it is equal to 137298²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 11543568481 + 7307172324 = 107441^2 + 85482^2 .

It is not a de Polignac number, because 18850740805 - 2⁷ = 18850740677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360126 + ... + 409135.

It is an arithmetic number, because the mean of its divisors is an integer number (1055812095).

Almost surely, 2^18850740805 is an apocalyptic number.

It is an amenable number.

18850740805 is a deficient number, since it is larger than the sum of its proper divisors (6488749475).

18850740805 is a wasteful number, since it uses less digits than its factorization.

18850740805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769321 (or 769308 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 46.

The spelling of 18850740805 in words is "eighteen billion, eight hundred fifty million, seven hundred forty thousand, eight hundred five".