18271271560 has 64 divisors (see below), whose sum is σ = 43871569920. Its totient is φ = 6824401920.

The previous prime is 18271271539. The next prime is 18271271561. The reversal of 18271271560 is 6517217281.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (18271271561) 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 15 ways as a sum of consecutive naturals, for example, 19426 + ... + 192145.

It is an arithmetic number, because the mean of its divisors is an integer number (685493280).

Almost surely, 2^18271271560 is an apocalyptic number.

18271271560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18271271560 is an abundant number, since it is smaller than the sum of its proper divisors (25600298360).

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

18271271560 is a wasteful number, since it uses less digits than its factorization.

18271271560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211726 (or 211722 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 18271271560 in words is "eighteen billion, two hundred seventy-one million, two hundred seventy-one thousand, five hundred sixty".