2585705721 has 8 divisors (see below), whose sum is σ = 3453234240. Its totient is φ = 1720990512.

The previous prime is 2585705719. The next prime is 2585705777. The reversal of 2585705721 is 1275075852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2585705721 - 2¹ = 2585705719 is a prime.

It is a super-2 number, since 2×2585705721² = 13371748151224259682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2585705711) 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 7 ways as a sum of consecutive naturals, for example, 701181 + ... + 704858.

It is an arithmetic number, because the mean of its divisors is an integer number (431654280).

Almost surely, 2^2585705721 is an apocalyptic number.

It is an amenable number.

2585705721 is a deficient number, since it is larger than the sum of its proper divisors (867528519).

2585705721 is a wasteful number, since it uses less digits than its factorization.

2585705721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406655.

The product of its (nonzero) digits is 196000, while the sum is 42.

The square root of 2585705721 is about 50849.8350144816. The cubic root of 2585705721 is about 1372.5442838257.

The spelling of 2585705721 in words is "two billion, five hundred eighty-five million, seven hundred five thousand, seven hundred twenty-one".