19018638274 has 4 divisors (see below), whose sum is σ = 28527957414. Its totient is φ = 9509319136.

The previous prime is 19018638271. The next prime is 19018638283. The reversal of 19018638274 is 47283681091.

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., 16487844025 + 2530794249 = 128405^2 + 50307^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19018638271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4754659567 + ... + 4754659570.

Almost surely, 2^19018638274 is an apocalyptic number.

19018638274 is a deficient number, since it is larger than the sum of its proper divisors (9509319140).

19018638274 is an equidigital number, since it uses as much as digits as its factorization.

19018638274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509319139.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 19018638274 in words is "nineteen billion, eighteen million, six hundred thirty-eight thousand, two hundred seventy-four".