16020587857 has 16 divisors (see below), whose sum is σ = 17510003280. Its totient is φ = 14596098048.

The previous prime is 16020587839. The next prime is 16020587897. The reversal of 16020587857 is 75878502061.

It can be written as a sum of positive squares in 8 ways, for example, as 7570566081 + 8450021776 = 87009^2 + 91924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16020587857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16020587857.

It is not an unprimeable number, because it can be changed into a prime (16020587897) by changing a digit.

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, 59269 + ... + 188557.

It is an arithmetic number, because the mean of its divisors is an integer number (1094375205).

Almost surely, 2^16020587857 is an apocalyptic number.

16020587857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16020587857 is a deficient number, since it is larger than the sum of its proper divisors (1489415423).

16020587857 is a wasteful number, since it uses less digits than its factorization.

16020587857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129540.

The product of its (nonzero) digits is 940800, while the sum is 49.

The spelling of 16020587857 in words is "sixteen billion, twenty million, five hundred eighty-seven thousand, eight hundred fifty-seven".