25646669065 has 8 divisors (see below), whose sum is σ = 30823869888. Its totient is φ = 20485423920.

The previous prime is 25646669063. The next prime is 25646669077. The reversal of 25646669065 is 56096664652.

It is a happy number.

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

It is not a de Polignac number, because 25646669065 - 2¹ = 25646669063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25646668997 and 25646669015.

It is not an unprimeable number, because it can be changed into a prime (25646669063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3985381 + ... + 3991810.

It is an arithmetic number, because the mean of its divisors is an integer number (3852983736).

Almost surely, 2^25646669065 is an apocalyptic number.

It is an amenable number.

25646669065 is a deficient number, since it is larger than the sum of its proper divisors (5177200823).

25646669065 is an equidigital number, since it uses as much as digits as its factorization.

25646669065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977839.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 25646669065 in words is "twenty-five billion, six hundred forty-six million, six hundred sixty-nine thousand, sixty-five".