25506128281 has 8 divisors (see below), whose sum is σ = 26112528000. Its totient is φ = 24905531760.

The previous prime is 25506128273. The next prime is 25506128287. The reversal of 25506128281 is 18282160552.

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 25506128281 - 2³ = 25506128273 is a prime.

It is a super-2 number, since 2×25506128281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25506128287) 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, 1441905 + ... + 1459486.

It is an arithmetic number, because the mean of its divisors is an integer number (3264066000).

Almost surely, 2^25506128281 is an apocalyptic number.

It is an amenable number.

25506128281 is a deficient number, since it is larger than the sum of its proper divisors (606399719).

25506128281 is a wasteful number, since it uses less digits than its factorization.

25506128281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901599.

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 25506128281 in words is "twenty-five billion, five hundred six million, one hundred twenty-eight thousand, two hundred eighty-one".