18621226723 has 16 divisors (see below), whose sum is σ = 20981993472. Its totient is φ = 16372440000.

The previous prime is 18621226693. The next prime is 18621226751. The reversal of 18621226723 is 32762212681.

It is a cyclic number.

It is not a de Polignac number, because 18621226723 - 2⁵ = 18621226691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18621226823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582198 + ... + 613348.

It is an arithmetic number, because the mean of its divisors is an integer number (1311374592).

Almost surely, 2^18621226723 is an apocalyptic number.

18621226723 is a deficient number, since it is larger than the sum of its proper divisors (2360766749).

18621226723 is a wasteful number, since it uses less digits than its factorization.

18621226723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32946.

The product of its digits is 96768, while the sum is 40.

The spelling of 18621226723 in words is "eighteen billion, six hundred twenty-one million, two hundred twenty-six thousand, seven hundred twenty-three".