18143639732 has 6 divisors (see below), whose sum is σ = 31751369538. Its totient is φ = 9071819864.

The previous prime is 18143639719. The next prime is 18143639743. The reversal of 18143639732 is 23793634181.

It can be written as a sum of positive squares in only one way, i.e., 14312772496 + 3830867236 = 119636^2 + 61894^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2267954963 + ... + 2267954970.

It is an arithmetic number, because the mean of its divisors is an integer number (5291894923).

Almost surely, 2^18143639732 is an apocalyptic number.

It is an amenable number.

18143639732 is a deficient number, since it is larger than the sum of its proper divisors (13607729806).

18143639732 is a wasteful number, since it uses less digits than its factorization.

18143639732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535909937 (or 4535909935 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The spelling of 18143639732 in words is "eighteen billion, one hundred forty-three million, six hundred thirty-nine thousand, seven hundred thirty-two".