16005547840 has 56 divisors (see below), whose sum is σ = 38635365960. Its totient is φ = 6314508288.

The previous prime is 16005547819. The next prime is 16005547841. The reversal of 16005547840 is 4874550061.

It can be written as a sum of positive squares in 4 ways, for example, as 5274245376 + 10731302464 = 72624^2 + 103592^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16005547793 and 16005547802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16005547841) 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 7 ways as a sum of consecutive naturals, for example, 319225 + ... + 365944.

Almost surely, 2^16005547840 is an apocalyptic number.

16005547840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16005547840 is an abundant number, since it is smaller than the sum of its proper divisors (22629818120).

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

16005547840 is an equidigital number, since it uses as much as digits as its factorization.

16005547840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685259 (or 685249 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 16005547840 in words is "sixteen billion, five million, five hundred forty-seven thousand, eight hundred forty".