25810212261 has 8 divisors (see below), whose sum is σ = 35062930080. Its totient is φ = 16882151312.

The previous prime is 25810212247. The next prime is 25810212271. The reversal of 25810212261 is 16221201852.

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

It is a cyclic number.

It is not a de Polignac number, because 25810212261 - 2¹⁹ = 25809687973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25810212271) 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, 81164031 + ... + 81164348.

It is an arithmetic number, because the mean of its divisors is an integer number (4382866260).

Almost surely, 2^25810212261 is an apocalyptic number.

It is an amenable number.

25810212261 is a deficient number, since it is larger than the sum of its proper divisors (9252717819).

25810212261 is a wasteful number, since it uses less digits than its factorization.

25810212261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162328435.

The product of its (nonzero) digits is 3840, while the sum is 30.

The spelling of 25810212261 in words is "twenty-five billion, eight hundred ten million, two hundred twelve thousand, two hundred sixty-one".