18194294037529 has 3 divisors (see below), whose sum is σ = 18194298303007. Its totient is φ = 18194289772052.

The previous prime is 18194294037499. The next prime is 18194294037539. The reversal of 18194294037529 is 92573049249181.

The square root of 18194294037529 is 4265477.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 15554150015625 + 2640144021904 = 3943875^2 + 1624852^2 .

It is not a de Polignac number, because 18194294037529 - 2¹⁹ = 18194293513241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18194294037539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2132739 + ... + 6398215.

Almost surely, 2^{18194294037529} is an apocalyptic number.

18194294037529 is the 4265477-th square number.

18194294037529 is the 2132739-th centered octagonal number.

It is an amenable number.

18194294037529 is a deficient number, since it is larger than the sum of its proper divisors (4265478).

18194294037529 is an frugal number, since it uses more digits than its factorization.

18194294037529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8530954 (or 4265477 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 64.

The spelling of 18194294037529 in words is "eighteen trillion, one hundred ninety-four billion, two hundred ninety-four million, thirty-seven thousand, five hundred twenty-nine".