18271761560 has 128 divisors (see below), whose sum is σ = 44839872000. Its totient is φ = 6660734976.

The previous prime is 18271761539. The next prime is 18271761569. The reversal of 18271761560 is 6516717281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18271761569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27149384 + ... + 27150056.

It is an arithmetic number, because the mean of its divisors is an integer number (350311500).

Almost surely, 2^18271761560 is an apocalyptic number.

18271761560 is a gapful number since it is divisible by the number (10) 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 18271761560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22419936000).

18271761560 is an abundant number, since it is smaller than the sum of its proper divisors (26568110440).

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

18271761560 is a wasteful number, since it uses less digits than its factorization.

18271761560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 18271761560 in words is "eighteen billion, two hundred seventy-one million, seven hundred sixty-one thousand, five hundred sixty".