25951975321 has 4 divisors (see below), whose sum is σ = 25952297572. Its totient is φ = 25951653072.

The previous prime is 25951975297. The next prime is 25951975331. The reversal of 25951975321 is 12357915952.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18241203600 + 7710771721 = 135060^2 + 87811^2 .

It is a cyclic number.

It is not a de Polignac number, because 25951975321 - 2²⁹ = 25415104409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25951975331) 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, 75991 + ... + 240163.

It is an arithmetic number, because the mean of its divisors is an integer number (6488074393).

Almost surely, 2^25951975321 is an apocalyptic number.

It is an amenable number.

25951975321 is a deficient number, since it is larger than the sum of its proper divisors (322251).

25951975321 is a wasteful number, since it uses less digits than its factorization.

25951975321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322250.

The product of its digits is 850500, while the sum is 49.

The spelling of 25951975321 in words is "twenty-five billion, nine hundred fifty-one million, nine hundred seventy-five thousand, three hundred twenty-one".