18322243641601 has 9 divisors (see below), whose sum is σ = 18932486682753. Its totient is φ = 17731075110660.

The previous prime is 18322243641487. The next prime is 18322243641613. The reversal of 18322243641601 is 10614634222381.

The square root of 18322243641601 is 4280449.

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

It is a de Polignac number, because none of the positive numbers 2^k-18322243641601 is a prime.

It is a super-2 number, since 2×18322243641601² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18322243641901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 132624880 + ... + 132762958.

It is an arithmetic number, because the mean of its divisors is an integer number (2103609631417).

Almost surely, 2^{18322243641601} is an apocalyptic number.

18322243641601 is the 4280449-th square number.

18322243641601 is the 2140225-th centered octagonal number.

It is an amenable number.

18322243641601 is a deficient number, since it is larger than the sum of its proper divisors (610243041152).

18322243641601 is an frugal number, since it uses more digits than its factorization.

18322243641601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276220 (or 138110 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

Adding to 18322243641601 its reverse (10614634222381), we get a palindrome (28936877863982).

The spelling of 18322243641601 in words is "eighteen trillion, three hundred twenty-two billion, two hundred forty-three million, six hundred forty-one thousand, six hundred one".