18491142852 has 144 divisors (see below), whose sum is σ = 57744610560. Its totient is φ = 4858424064.

The previous prime is 18491142847. The next prime is 18491142853. The reversal of 18491142852 is 25824119481.

18491142852 is a `hidden beast` number, since 18 + 491 + 142 + 8 + 5 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18491142798 and 18491142807.

It is not an unprimeable number, because it can be changed into a prime (18491142853) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 870753 + ... + 891735.

It is an arithmetic number, because the mean of its divisors is an integer number (401004240).

Almost surely, 2^18491142852 is an apocalyptic number.

18491142852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18491142852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28872305280).

18491142852 is an abundant number, since it is smaller than the sum of its proper divisors (39253467708).

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

18491142852 is a wasteful number, since it uses less digits than its factorization.

18491142852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21282 (or 21277 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The spelling of 18491142852 in words is "eighteen billion, four hundred ninety-one million, one hundred forty-two thousand, eight hundred fifty-two".