16391820560 has 40 divisors (see below), whose sum is σ = 38116369176. Its totient is φ = 6555801600.

The previous prime is 16391820559. The next prime is 16391820569. The reversal of 16391820560 is 6502819361.

It can be written as a sum of positive squares in 4 ways, for example, as 5355897856 + 11035922704 = 73184^2 + 105052^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (16391820569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 975752 + ... + 992408.

Almost surely, 2^16391820560 is an apocalyptic number.

16391820560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16391820560 is an abundant number, since it is smaller than the sum of its proper divisors (21724548616).

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

16391820560 is a wasteful number, since it uses less digits than its factorization.

16391820560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28971 (or 28965 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 16391820560 in words is "sixteen billion, three hundred ninety-one million, eight hundred twenty thousand, five hundred sixty".