18147143684 has 6 divisors (see below), whose sum is σ = 31757501454. Its totient is φ = 9073571840.

The previous prime is 18147143669. The next prime is 18147143717. The reversal of 18147143684 is 48634174181.

It can be written as a sum of positive squares in only one way, i.e., 15168385600 + 2978758084 = 123160^2 + 54578^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2268392957 + ... + 2268392964.

It is an arithmetic number, because the mean of its divisors is an integer number (5292916909).

Almost surely, 2^18147143684 is an apocalyptic number.

It is an amenable number.

18147143684 is a deficient number, since it is larger than the sum of its proper divisors (13610357770).

18147143684 is a wasteful number, since it uses less digits than its factorization.

18147143684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536785925 (or 4536785923 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The spelling of 18147143684 in words is "eighteen billion, one hundred forty-seven million, one hundred forty-three thousand, six hundred eighty-four".