25621065121 has 8 divisors (see below), whose sum is σ = 26069724288. Its totient is φ = 25173330000.

The previous prime is 25621065097. The next prime is 25621065133. The reversal of 25621065121 is 12156012652.

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 25621065121 - 2¹¹ = 25621063073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25621065161) by changing a digit.

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, 174955 + ... + 286096.

It is an arithmetic number, because the mean of its divisors is an integer number (3258715536).

Almost surely, 2^25621065121 is an apocalyptic number.

It is an amenable number.

25621065121 is a deficient number, since it is larger than the sum of its proper divisors (448659167).

25621065121 is an equidigital number, since it uses as much as digits as its factorization.

25621065121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462023.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 25621065121 its reverse (12156012652), we get a palindrome (37777077773).

The spelling of 25621065121 in words is "twenty-five billion, six hundred twenty-one million, sixty-five thousand, one hundred twenty-one".