25206065281 has 4 divisors (see below), whose sum is σ = 25299076864. Its totient is φ = 25113053700.

The previous prime is 25206065273. The next prime is 25206065293. The reversal of 25206065281 is 18256060252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25206065281 - 2³ = 25206065273 is a prime.

It is a super-2 number, since 2×25206065281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25206065281.

It is not an unprimeable number, because it can be changed into a prime (25206065201) 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, 46505385 + ... + 46505926.

It is an arithmetic number, because the mean of its divisors is an integer number (6324769216).

Almost surely, 2^25206065281 is an apocalyptic number.

It is an amenable number.

25206065281 is a deficient number, since it is larger than the sum of its proper divisors (93011583).

25206065281 is an equidigital number, since it uses as much as digits as its factorization.

25206065281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93011582.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 25206065281 in words is "twenty-five billion, two hundred six million, sixty-five thousand, two hundred eighty-one".