2565165874 has 8 divisors (see below), whose sum is σ = 3852507420. Its totient is φ = 1280996736.

The previous prime is 2565165871. The next prime is 2565165877. The reversal of 2565165874 is 4785615652.

It is an interprime number because it is at equal distance from previous prime (2565165871) and next prime (2565165877).

It can be written as a sum of positive squares in 2 ways, for example, as 2027250625 + 537915249 = 45025^2 + 23193^2 .

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

It is a super-2 number, since 2×2565165874² = 13160151922268367752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2565165871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791079 + ... + 794314.

Almost surely, 2^2565165874 is an apocalyptic number.

2565165874 is a deficient number, since it is larger than the sum of its proper divisors (1287341546).

2565165874 is a wasteful number, since it uses less digits than its factorization.

2565165874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1586204.

The product of its digits is 2016000, while the sum is 49.

The square root of 2565165874 is about 50647.4666098908. The cubic root of 2565165874 is about 1368.9002974620.

The spelling of 2565165874 in words is "two billion, five hundred sixty-five million, one hundred sixty-five thousand, eight hundred seventy-four".