18005970313 has 4 divisors (see below), whose sum is σ = 18120658180. Its totient is φ = 17891282448.

The previous prime is 18005970277. The next prime is 18005970329. The reversal of 18005970313 is 31307950081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31307950081 = 37 ⋅846160813.

It can be written as a sum of positive squares in 2 ways, for example, as 6910929424 + 11095040889 = 83132^2 + 105333^2 .

It is a cyclic number.

It is not a de Polignac number, because 18005970313 - 2⁹ = 18005969801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18005970373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57343698 + ... + 57344011.

It is an arithmetic number, because the mean of its divisors is an integer number (4530164545).

Almost surely, 2^18005970313 is an apocalyptic number.

It is an amenable number.

18005970313 is a deficient number, since it is larger than the sum of its proper divisors (114687867).

18005970313 is a wasteful number, since it uses less digits than its factorization.

18005970313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114687866.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 18005970313 in words is "eighteen billion, five million, nine hundred seventy thousand, three hundred thirteen".