18954223236 has 240 divisors, whose sum is σ = 58329976320. Its totient is φ = 5311319040.

The previous prime is 18954223201. The next prime is 18954223259. The reversal of 18954223236 is 63232245981.

18954223236 is a `hidden beast` number, since 1 + 89 + 542 + 2 + 3 + 23 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18954223191 and 18954223200.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2215455 + ... + 2223993.

It is an arithmetic number, because the mean of its divisors is an integer number (243041568).

Almost surely, 2^18954223236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18954223236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29164988160).

18954223236 is an abundant number, since it is smaller than the sum of its proper divisors (39375753084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18954223236 is a wasteful number, since it uses less digits than its factorization.

18954223236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8616 (or 8605 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 18954223236 in words is "eighteen billion, nine hundred fifty-four million, two hundred twenty-three thousand, two hundred thirty-six".