25961765 has 4 divisors (see below), whose sum is σ = 31154124. Its totient is φ = 20769408.

The previous prime is 25961743. The next prime is 25961773. The reversal of 25961765 is 56716952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4190209 + 21771556 = 2047^2 + 4666^2 .

It is a cyclic number.

It is not a de Polignac number, because 25961765 - 2¹⁰ = 25960741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596172 + ... + 2596181.

It is an arithmetic number, because the mean of its divisors is an integer number (7788531).

Almost surely, 2^25961765 is an apocalyptic number.

It is an amenable number.

25961765 is a deficient number, since it is larger than the sum of its proper divisors (5192359).

25961765 is an equidigital number, since it uses as much as digits as its factorization.

25961765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192358.

The product of its digits is 113400, while the sum is 41.

The square root of 25961765 is about 5095.2688839746. The cubic root of 25961765 is about 296.1043163187.

The spelling of 25961765 in words is "twenty-five million, nine hundred sixty-one thousand, seven hundred sixty-five".