25551502656261 has 16 divisors (see below), whose sum is σ = 34152829912320. Its totient is φ = 16992257356800.

The previous prime is 25551502656217. The next prime is 25551502656299. The reversal of 25551502656261 is 16265620515552.

It is not a de Polignac number, because 25551502656261 - 2¹³ = 25551502648069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551502656661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52704981 + ... + 53187573.

It is an arithmetic number, because the mean of its divisors is an integer number (2134551869520).

Almost surely, 2^{25551502656261} is an apocalyptic number.

It is an amenable number.

25551502656261 is a deficient number, since it is larger than the sum of its proper divisors (8601327256059).

25551502656261 is a wasteful number, since it uses less digits than its factorization.

25551502656261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526156.

The product of its (nonzero) digits is 5400000, while the sum is 51.

The spelling of 25551502656261 in words is "twenty-five trillion, five hundred fifty-one billion, five hundred two million, six hundred fifty-six thousand, two hundred sixty-one".