25506050091 has 8 divisors (see below), whose sum is σ = 35797965120. Its totient is φ = 16109084232.

The previous prime is 25506050081. The next prime is 25506050107. The reversal of 25506050091 is 19005060552.

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

It is not a de Polignac number, because 25506050091 - 2⁶ = 25506050027 is a prime.

It is a super-2 number, since 2×25506050091² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25506050071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223737225 + ... + 223737338.

It is an arithmetic number, because the mean of its divisors is an integer number (4474745640).

Almost surely, 2^25506050091 is an apocalyptic number.

25506050091 is a deficient number, since it is larger than the sum of its proper divisors (10291915029).

25506050091 is a wasteful number, since it uses less digits than its factorization.

25506050091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447474585.

The product of its (nonzero) digits is 13500, while the sum is 33.

The spelling of 25506050091 in words is "twenty-five billion, five hundred six million, fifty thousand, ninety-one".