18223749947574 has 120 divisors (see below), whose sum is σ = 42766559086680. Its totient is φ = 5799210899328.

The previous prime is 18223749947573. The next prime is 18223749947639. The reversal of 18223749947574 is 47574994732281.

It is a happy number.

18223749947574 is a `hidden beast` number, since 1 + 8 + 2 + 2 + 3 + 7 + 4 + 9 + 9 + 47 + 574 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18223749947573) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 11374077 + ... + 12876999.

It is an arithmetic number, because the mean of its divisors is an integer number (356387992389).

Almost surely, 2^{18223749947574} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18223749947574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21383279543340).

18223749947574 is an abundant number, since it is smaller than the sum of its proper divisors (24542809139106).

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

18223749947574 is a wasteful number, since it uses less digits than its factorization.

18223749947574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503084 (or 1503046 counting only the distinct ones).

The product of its digits is 853493760, while the sum is 72.

The spelling of 18223749947574 in words is "eighteen trillion, two hundred twenty-three billion, seven hundred forty-nine million, nine hundred forty-seven thousand, five hundred seventy-four".