18549090194 has 16 divisors (see below), whose sum is σ = 29272596696. Its totient is φ = 8803785600.

The previous prime is 18549090193. The next prime is 18549090221. The reversal of 18549090194 is 49109094581.

It can be written as a sum of positive squares in 4 ways, for example, as 9330594025 + 9218496169 = 96595^2 + 96013^2 .

It is not an unprimeable number, because it can be changed into a prime (18549090191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3053837 + ... + 3059904.

Almost surely, 2^18549090194 is an apocalyptic number.

18549090194 is a deficient number, since it is larger than the sum of its proper divisors (10723506502).

18549090194 is a wasteful number, since it uses less digits than its factorization.

18549090194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113821.

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 18549090194 in words is "eighteen billion, five hundred forty-nine million, ninety thousand, one hundred ninety-four".