18245618277121 has 3 divisors (see below), whose sum is σ = 18245622548611. Its totient is φ = 18245614005632.

The previous prime is 18245618277109. The next prime is 18245618277149. The reversal of 18245618277121 is 12177281654281.

It is a happy number.

The square root of 18245618277121 is 4271489.

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., 17772219235521 + 473399041600 = 4215711^2 + 688040^2 .

It is not a de Polignac number, because 18245618277121 - 2⁹ = 18245618276609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18245618277101) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2135745 + ... + 6407233.

Almost surely, 2^{18245618277121} is an apocalyptic number.

18245618277121 is the 4271489-th square number.

18245618277121 is the 2135745-th centered octagonal number.

It is an amenable number.

18245618277121 is a deficient number, since it is larger than the sum of its proper divisors (4271490).

18245618277121 is an frugal number, since it uses more digits than its factorization.

18245618277121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8542978 (or 4271489 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 55.

The spelling of 18245618277121 in words is "eighteen trillion, two hundred forty-five billion, six hundred eighteen million, two hundred seventy-seven thousand, one hundred twenty-one".