25085075261 has 4 divisors (see below), whose sum is σ = 26405342400. Its totient is φ = 23764808124.

The previous prime is 25085075251. The next prime is 25085075317. The reversal of 25085075261 is 16257058052.

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 a de Polignac number, because none of the positive numbers 2^k-25085075261 is a prime.

It is a super-2 number, since 2×25085075261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25085075251) 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, 660133541 + ... + 660133578.

It is an arithmetic number, because the mean of its divisors is an integer number (6601335600).

Almost surely, 2^25085075261 is an apocalyptic number.

It is an amenable number.

25085075261 is a deficient number, since it is larger than the sum of its proper divisors (1320267139).

25085075261 is a wasteful number, since it uses less digits than its factorization.

25085075261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320267138.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 25085075261 in words is "twenty-five billion, eighty-five million, seventy-five thousand, two hundred sixty-one".