18071131572 has 144 divisors (see below), whose sum is σ = 53569152000. Its totient is φ = 5085980928.

The previous prime is 18071131549. The next prime is 18071131577. The reversal of 18071131572 is 27513117081.

18071131572 is a `hidden beast` number, since 1 + 8 + 0 + 71 + 13 + 1 + 572 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071131577) 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, 222829 + ... + 292907.

It is an arithmetic number, because the mean of its divisors is an integer number (372008000).

Almost surely, 2^18071131572 is an apocalyptic number.

18071131572 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 18071131572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784576000).

18071131572 is an abundant number, since it is smaller than the sum of its proper divisors (35498020428).

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

18071131572 is a wasteful number, since it uses less digits than its factorization.

18071131572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70150 (or 70145 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 36.

The spelling of 18071131572 in words is "eighteen billion, seventy-one million, one hundred thirty-one thousand, five hundred seventy-two".