16531901878180 has 48 divisors (see below), whose sum is σ = 38299422987504. Its totient is φ = 5955206676480.

The previous prime is 16531901878081. The next prime is 16531901878199. The reversal of 16531901878180 is 8187810913561.

It can be written as a sum of positive squares in 8 ways, for example, as 5209094134336 + 11322807743844 = 2282344^2 + 3364938^2 .

It is a super-2 number, since 2×16531901878180² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775406877 + ... + 775428196.

It is an arithmetic number, because the mean of its divisors is an integer number (797904645573).

Almost surely, 2^{16531901878180} is an apocalyptic number.

16531901878180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16531901878180 is an abundant number, since it is smaller than the sum of its proper divisors (21767521109324).

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

16531901878180 is a wasteful number, since it uses less digits than its factorization.

16531901878180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550835136 (or 1550835134 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 58.

The spelling of 16531901878180 in words is "sixteen trillion, five hundred thirty-one billion, nine hundred one million, eight hundred seventy-eight thousand, one hundred eighty".