18538143700 has 36 divisors (see below), whose sum is σ = 40460340060. Its totient is φ = 7372387840.

The previous prime is 18538143667. The next prime is 18538143737. The reversal of 18538143700 is 734183581.

It can be written as a sum of positive squares in 6 ways, for example, as 49758916 + 18488384784 = 7054^2 + 135972^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 518485 + ... + 553084.

It is an arithmetic number, because the mean of its divisors is an integer number (1123898335).

Almost surely, 2^18538143700 is an apocalyptic number.

18538143700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18538143700 is an abundant number, since it is smaller than the sum of its proper divisors (21922196360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18538143700 is a wasteful number, since it uses less digits than its factorization.

18538143700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071756 (or 1071749 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 18538143700 in words is "eighteen billion, five hundred thirty-eight million, one hundred forty-three thousand, seven hundred".