18261054321 has 4 divisors (see below), whose sum is σ = 24348072432. Its totient is φ = 12174036212.

The previous prime is 18261054293. The next prime is 18261054323. The reversal of 18261054321 is 12345016281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18261054321 - 2⁹ = 18261053809 is a prime.

It is a super-2 number, since 2×18261054321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18261054323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3043509051 + ... + 3043509056.

It is an arithmetic number, because the mean of its divisors is an integer number (6087018108).

Almost surely, 2^18261054321 is an apocalyptic number.

It is an amenable number.

18261054321 is a deficient number, since it is larger than the sum of its proper divisors (6087018111).

18261054321 is an equidigital number, since it uses as much as digits as its factorization.

18261054321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087018110.

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 18261054321 in words is "eighteen billion, two hundred sixty-one million, fifty-four thousand, three hundred twenty-one".