25651281965 has 8 divisors (see below), whose sum is σ = 30782427000. Its totient is φ = 20520433152.

The previous prime is 25651281937. The next prime is 25651281973. The reversal of 25651281965 is 56918215652.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11782451209 + 13868830756 = 108547^2 + 117766^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25651281965 - 2¹⁶ = 25651216429 is a prime.

It is a super-2 number, since 2×25651281965² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 229817 + ... + 322673.

It is an arithmetic number, because the mean of its divisors is an integer number (3847803375).

Almost surely, 2^25651281965 is an apocalyptic number.

It is an amenable number.

25651281965 is a deficient number, since it is larger than the sum of its proper divisors (5131145035).

25651281965 is an equidigital number, since it uses as much as digits as its factorization.

25651281965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148111.

The product of its digits is 1296000, while the sum is 50.

The spelling of 25651281965 in words is "twenty-five billion, six hundred fifty-one million, two hundred eighty-one thousand, nine hundred sixty-five".