16081812000 has 144 divisors (see below), whose sum is σ = 57074478552. Its totient is φ = 4288473600.

The previous prime is 16081811969. The next prime is 16081812001. The reversal of 16081812000 is 21818061.

It can be written as a sum of positive squares in 4 ways, for example, as 5434048656 + 10647763344 = 73716^2 + 103188^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (16081812001) 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, 187359 + ... + 259358.

Almost surely, 2^16081812000 is an apocalyptic number.

16081812000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16081812000 is an abundant number, since it is smaller than the sum of its proper divisors (40992666552).

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

16081812000 is a wasteful number, since it uses less digits than its factorization.

16081812000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446748 (or 446727 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The spelling of 16081812000 in words is "sixteen billion, eighty-one million, eight hundred twelve thousand".