18186139359441 has 27 divisors (see below), whose sum is σ = 26397873343803. Its totient is φ = 12064841651520.

The previous prime is 18186139359439. The next prime is 18186139359481. The reversal of 18186139359441 is 14495393168181.

The square root of 18186139359441 is 4264521.

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

18186139359441 is a `hidden beast` number, since 1 + 8 + 1 + 8 + 6 + 1 + 39 + 3 + 594 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9289663931025 + 8896475428416 = 3047895^2 + 2982696^2 .

It is not a de Polignac number, because 18186139359441 - 2¹ = 18186139359439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18186139359481) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2699438425 + ... + 2699445161.

Almost surely, 2^{18186139359441} is an apocalyptic number.

18186139359441 is the 4264521-st square number.

18186139359441 is the 2132261-st centered octagonal number.

It is an amenable number.

18186139359441 is a deficient number, since it is larger than the sum of its proper divisors (8211733984362).

18186139359441 is an frugal number, since it uses more digits than its factorization.

18186139359441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13902 (or 6951 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The spelling of 18186139359441 in words is "eighteen trillion, one hundred eighty-six billion, one hundred thirty-nine million, three hundred fifty-nine thousand, four hundred forty-one".