25351656512321 has 4 divisors (see below), whose sum is σ = 26225851564500. Its totient is φ = 24477461460144.

The previous prime is 25351656512317. The next prime is 25351656512327. The reversal of 25351656512321 is 12321565615352.

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 12171997567921 + 13179658944400 = 3488839^2 + 3630380^2 .

It is a cyclic number.

It is not a de Polignac number, because 25351656512321 - 2² = 25351656512317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25351656512327) 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, 437097526046 + ... + 437097526103.

It is an arithmetic number, because the mean of its divisors is an integer number (6556462891125).

Almost surely, 2^{25351656512321} is an apocalyptic number.

It is an amenable number.

25351656512321 is a deficient number, since it is larger than the sum of its proper divisors (874195052179).

25351656512321 is an equidigital number, since it uses as much as digits as its factorization.

25351656512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874195052178.

The product of its digits is 1620000, while the sum is 47.

The spelling of 25351656512321 in words is "twenty-five trillion, three hundred fifty-one billion, six hundred fifty-six million, five hundred twelve thousand, three hundred twenty-one".