2585981842 has 4 divisors (see below), whose sum is σ = 3878972766. Its totient is φ = 1292990920.

The previous prime is 2585981831. The next prime is 2585981897. The reversal of 2585981842 is 2481895852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2364001641 + 221980201 = 48621^2 + 14899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2585981842.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 646495459 + ... + 646495462.

Almost surely, 2^2585981842 is an apocalyptic number.

2585981842 is a deficient number, since it is larger than the sum of its proper divisors (1292990924).

2585981842 is a wasteful number, since it uses less digits than its factorization.

2585981842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292990923.

The product of its digits is 1843200, while the sum is 52.

The square root of 2585981842 is about 50852.5500048916. The cubic root of 2585981842 is about 1372.5931389355.

It can be divided in two parts, 25859 and 81842, that added together give a palindrome (107701).

The spelling of 2585981842 in words is "two billion, five hundred eighty-five million, nine hundred eighty-one thousand, eight hundred forty-two".