2865191616 has 392 divisors, whose sum is σ = 10092114944. Its totient is φ = 789419520.

The previous prime is 2865191599. The next prime is 2865191699. The reversal of 2865191616 is 6161915682.

2865191616 is a `hidden beast` number, since 28 + 6 + 5 + 1 + 9 + 1 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 10124211 + ... + 10124493.

Almost surely, 2^2865191616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2865191616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5046057472).

2865191616 is an abundant number, since it is smaller than the sum of its proper divisors (7226923328).

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

2865191616 is an equidigital number, since it uses as much as digits as its factorization.

2865191616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 326 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 2865191616 is about 53527.4846784341. The cubic root of 2865191616 is about 1420.3146191714.

It can be divided in two parts, 2865 and 191616, that added together give a 4-th power (194481 = 21⁴).

The spelling of 2865191616 in words is "two billion, eight hundred sixty-five million, one hundred ninety-one thousand, six hundred sixteen".