18142473636 has 135 divisors (see below), whose sum is σ = 55223016849. Its totient is φ = 5178714912.

The previous prime is 18142473617. The next prime is 18142473647. The reversal of 18142473636 is 63637424181.

The square root of 18142473636 is 134694.

It is a perfect power (a square), and thus also a powerful number.

18142473636 is a `hidden beast` number, since 1 + 8 + 1 + 4 + 2 + 4 + 7 + 3 + 636 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8483515236 + 9658958400 = 92106^2 + 98280^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18142473591 and 18142473600.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 16970910 + ... + 16971978.

Almost surely, 2^18142473636 is an apocalyptic number.

18142473636 is the 134694-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18142473636

18142473636 is an abundant number, since it is smaller than the sum of its proper divisors (37080543213).

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

18142473636 is an equidigital number, since it uses as much as digits as its factorization.

18142473636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2168 (or 1081 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The spelling of 18142473636 in words is "eighteen billion, one hundred forty-two million, four hundred seventy-three thousand, six hundred thirty-six".