25688654461 has 4 divisors (see below), whose sum is σ = 25924330300. Its totient is φ = 25452978624.

The previous prime is 25688654447. The next prime is 25688654479. The reversal of 25688654461 is 16445688652.

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 6170888025 + 19517766436 = 78555^2 + 139706^2 .

It is a cyclic number.

It is not a de Polignac number, because 25688654461 - 2¹⁹ = 25688130173 is a prime.

It is a super-3 number, since 3×25688654461³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25688654861) 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, 117837756 + ... + 117837973.

It is an arithmetic number, because the mean of its divisors is an integer number (6481082575).

Almost surely, 2^25688654461 is an apocalyptic number.

It is an amenable number.

25688654461 is a deficient number, since it is larger than the sum of its proper divisors (235675839).

25688654461 is a wasteful number, since it uses less digits than its factorization.

25688654461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235675838.

The product of its digits is 11059200, while the sum is 55.

The spelling of 25688654461 in words is "twenty-five billion, six hundred eighty-eight million, six hundred fifty-four thousand, four hundred sixty-one".