2605021859 has 16 divisors (see below), whose sum is σ = 2905528320. Its totient is φ = 2315242560.

The previous prime is 2605021813. The next prime is 2605021891. The reversal of 2605021859 is 9581205062.

It is a de Polignac number, because none of the positive numbers 2^k-2605021859 is a prime.

It is a super-2 number, since 2×2605021859² = 13572277771735631762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605029859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581462 + ... + 585924.

It is an arithmetic number, because the mean of its divisors is an integer number (181595520).

Almost surely, 2^2605021859 is an apocalyptic number.

2605021859 is a deficient number, since it is larger than the sum of its proper divisors (300506461).

2605021859 is a wasteful number, since it uses less digits than its factorization.

2605021859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 2605021859 is about 51039.4147595758. The cubic root of 2605021859 is about 1375.9536056432.

The spelling of 2605021859 in words is "two billion, six hundred five million, twenty-one thousand, eight hundred fifty-nine".