18294808538 has 4 divisors (see below), whose sum is σ = 27442212810. Its totient is φ = 9147404268.

The previous prime is 18294808529. The next prime is 18294808579. The reversal of 18294808538 is 83580849281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83580849281 = 967 ⋅86433143.

It can be written as a sum of positive squares in only one way, i.e., 16308056209 + 1986752329 = 127703^2 + 44573^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4573702133 + ... + 4573702136.

Almost surely, 2^18294808538 is an apocalyptic number.

18294808538 is a deficient number, since it is larger than the sum of its proper divisors (9147404272).

18294808538 is an equidigital number, since it uses as much as digits as its factorization.

18294808538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9147404271.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 18294808538 in words is "eighteen billion, two hundred ninety-four million, eight hundred eight thousand, five hundred thirty-eight".