18364558650321 has 32 divisors (see below), whose sum is σ = 26389440282240. Its totient is φ = 11292775547904.

The previous prime is 18364558650259. The next prime is 18364558650329. The reversal of 18364558650321 is 12305685546381.

It is not a de Polignac number, because 18364558650321 - 2¹⁴ = 18364558633937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18364558650329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 637267705 + ... + 637296521.

It is an arithmetic number, because the mean of its divisors is an integer number (824670008820).

Almost surely, 2^{18364558650321} is an apocalyptic number.

It is an amenable number.

18364558650321 is a deficient number, since it is larger than the sum of its proper divisors (8024881631919).

18364558650321 is a wasteful number, since it uses less digits than its factorization.

18364558650321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40545.

The product of its (nonzero) digits is 20736000, while the sum is 57.

The spelling of 18364558650321 in words is "eighteen trillion, three hundred sixty-four billion, five hundred fifty-eight million, six hundred fifty thousand, three hundred twenty-one".