16271660538 has 80 divisors (see below), whose sum is σ = 41841412800. Its totient is φ = 4649045868.

The previous prime is 16271660467. The next prime is 16271660543. The reversal of 16271660538 is 83506617261.

16271660538 is a `hidden beast` number, since 1 + 6 + 2 + 7 + 1 + 6 + 605 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 16271660493 and 16271660502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2324522931 + ... + 2324522937.

It is an arithmetic number, because the mean of its divisors is an integer number (523017660).

Almost surely, 2^16271660538 is an apocalyptic number.

16271660538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16271660538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20920706400).

16271660538 is an abundant number, since it is smaller than the sum of its proper divisors (25569752262).

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

16271660538 is an frugal number, since it uses more digits than its factorization.

16271660538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 16271660538 in words is "sixteen billion, two hundred seventy-one million, six hundred sixty thousand, five hundred thirty-eight".