18040771656 has 160 divisors (see below), whose sum is σ = 52434624000. Its totient is φ = 5789076480.

The previous prime is 18040771633. The next prime is 18040771657. The reversal of 18040771656 is 65617704081.

18040771656 is a `hidden beast` number, since 1 + 80 + 407 + 7 + 165 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (18040771657) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3995256 + ... + 3999768.

It is an arithmetic number, because the mean of its divisors is an integer number (327716400).

Almost surely, 2^18040771656 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 18040771656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26217312000).

18040771656 is an abundant number, since it is smaller than the sum of its proper divisors (34393852344).

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

18040771656 is a wasteful number, since it uses less digits than its factorization.

18040771656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761 (or 4748 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 18040771656 in words is "eighteen billion, forty million, seven hundred seventy-one thousand, six hundred fifty-six".