18683237522 has 4 divisors (see below), whose sum is σ = 28024856286. Its totient is φ = 9341618760.

The previous prime is 18683237509. The next prime is 18683237527. The reversal of 18683237522 is 22573238681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22573238681 = 7 ⋅3224748383.

It can be written as a sum of positive squares in only one way, i.e., 15217442881 + 3465794641 = 123359^2 + 58871^2 .

It is not an unprimeable number, because it can be changed into a prime (18683237527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4670809379 + ... + 4670809382.

Almost surely, 2^18683237522 is an apocalyptic number.

18683237522 is a deficient number, since it is larger than the sum of its proper divisors (9341618764).

18683237522 is an equidigital number, since it uses as much as digits as its factorization.

18683237522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9341618763.

The product of its digits is 967680, while the sum is 47.

The spelling of 18683237522 in words is "eighteen billion, six hundred eighty-three million, two hundred thirty-seven thousand, five hundred twenty-two".