16538878872 has 96 divisors (see below), whose sum is σ = 46399392000. Its totient is φ = 5315735040.

The previous prime is 16538878841. The next prime is 16538878877. The reversal of 16538878872 is 27887883561.

16538878872 is a `hidden beast` number, since 16 + 538 + 8 + 7 + 8 + 87 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16538878877) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1684297 + ... + 1694087.

It is an arithmetic number, because the mean of its divisors is an integer number (483327000).

Almost surely, 2^16538878872 is an apocalyptic number.

16538878872 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 16538878872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23199696000).

16538878872 is an abundant number, since it is smaller than the sum of its proper divisors (29860513128).

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

16538878872 is a wasteful number, since it uses less digits than its factorization.

16538878872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10641 (or 10634 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 63.

The spelling of 16538878872 in words is "sixteen billion, five hundred thirty-eight million, eight hundred seventy-eight thousand, eight hundred seventy-two".