25655811261 has 8 divisors (see below), whose sum is σ = 34229924160. Its totient is φ = 17092786272.

The previous prime is 25655811253. The next prime is 25655811271. The reversal of 25655811261 is 16211855652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25655811261 - 2³ = 25655811253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25655811221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2766576 + ... + 2775833.

It is an arithmetic number, because the mean of its divisors is an integer number (4278740520).

Almost surely, 2^25655811261 is an apocalyptic number.

It is an amenable number.

25655811261 is a deficient number, since it is larger than the sum of its proper divisors (8574112899).

25655811261 is a wasteful number, since it uses less digits than its factorization.

25655811261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543955.

The product of its digits is 144000, while the sum is 42.

The spelling of 25655811261 in words is "twenty-five billion, six hundred fifty-five million, eight hundred eleven thousand, two hundred sixty-one".