18750312865 has 4 divisors (see below), whose sum is σ = 22500375444. Its totient is φ = 15000250288.

The previous prime is 18750312863. The next prime is 18750312929. The reversal of 18750312865 is 56821305781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56821305781 = 2131 ⋅26664151.

It can be written as a sum of positive squares in 2 ways, for example, as 5608212544 + 13142100321 = 74888^2 + 114639^2 .

It is a cyclic number.

It is not a de Polignac number, because 18750312865 - 2¹ = 18750312863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18750312863) 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, 1875031282 + ... + 1875031291.

It is an arithmetic number, because the mean of its divisors is an integer number (5625093861).

Almost surely, 2^18750312865 is an apocalyptic number.

It is an amenable number.

18750312865 is a deficient number, since it is larger than the sum of its proper divisors (3750062579).

18750312865 is an equidigital number, since it uses as much as digits as its factorization.

18750312865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750062578.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 18750312865 in words is "eighteen billion, seven hundred fifty million, three hundred twelve thousand, eight hundred sixty-five".