25155618261 has 8 divisors (see below), whose sum is σ = 33575513664. Its totient is φ = 16753067520.

The previous prime is 25155618247. The next prime is 25155618311. The reversal of 25155618261 is 16281655152.

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

It is not a de Polignac number, because 25155618261 - 2⁶ = 25155618197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155618221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4332780 + ... + 4338581.

It is an arithmetic number, because the mean of its divisors is an integer number (4196939208).

Almost surely, 2^25155618261 is an apocalyptic number.

It is an amenable number.

25155618261 is a deficient number, since it is larger than the sum of its proper divisors (8419895403).

25155618261 is an equidigital number, since it uses as much as digits as its factorization.

25155618261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8672331.

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

The spelling of 25155618261 in words is "twenty-five billion, one hundred fifty-five million, six hundred eighteen thousand, two hundred sixty-one".