18731857143 has 4 divisors (see below), whose sum is σ = 24975809528. Its totient is φ = 12487904760.

The previous prime is 18731857139. The next prime is 18731857171. The reversal of 18731857143 is 34175813781.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18731857143 - 2² = 18731857139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18731857092 and 18731857101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18731853143) 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, 3121976188 + ... + 3121976193.

It is an arithmetic number, because the mean of its divisors is an integer number (6243952382).

Almost surely, 2^18731857143 is an apocalyptic number.

18731857143 is a deficient number, since it is larger than the sum of its proper divisors (6243952385).

18731857143 is an equidigital number, since it uses as much as digits as its factorization.

18731857143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243952384.

The product of its digits is 564480, while the sum is 48.

The spelling of 18731857143 in words is "eighteen billion, seven hundred thirty-one million, eight hundred fifty-seven thousand, one hundred forty-three".