16566065140 has 24 divisors (see below), whose sum is σ = 36835133832. Its totient is φ = 6236636160.

The previous prime is 16566065099. The next prime is 16566065143. The reversal of 16566065140 is 4156066561.

It can be written as a sum of positive squares in 4 ways, for example, as 4478821776 + 12087243364 = 66924^2 + 109942^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16566065093 and 16566065102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566065143) 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, 24361521 + ... + 24362200.

It is an arithmetic number, because the mean of its divisors is an integer number (1534797243).

Almost surely, 2^16566065140 is an apocalyptic number.

16566065140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16566065140 is an abundant number, since it is smaller than the sum of its proper divisors (20269068692).

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

16566065140 is a wasteful number, since it uses less digits than its factorization.

16566065140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48723747 (or 48723745 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 16566065140 in words is "sixteen billion, five hundred sixty-six million, sixty-five thousand, one hundred forty".