18326661274 has 4 divisors (see below), whose sum is σ = 27489991914. Its totient is φ = 9163330636.

The previous prime is 18326661271. The next prime is 18326661289. The reversal of 18326661274 is 47216662381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13922348049 + 4404313225 = 117993^2 + 66365^2 .

It is not an unprimeable number, because it can be changed into a prime (18326661271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4581665317 + ... + 4581665320.

Almost surely, 2^18326661274 is an apocalyptic number.

18326661274 is a deficient number, since it is larger than the sum of its proper divisors (9163330640).

18326661274 is an equidigital number, since it uses as much as digits as its factorization.

18326661274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9163330639.

The product of its digits is 580608, while the sum is 46.

The spelling of 18326661274 in words is "eighteen billion, three hundred twenty-six million, six hundred sixty-one thousand, two hundred seventy-four".