25257221107 has 4 divisors (see below), whose sum is σ = 25258529536. Its totient is φ = 25255912680.

The previous prime is 25257221023. The next prime is 25257221123. The reversal of 25257221107 is 70112275252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25257221107 - 2³¹ = 23109737459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25257221137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624819 + ... + 664012.

It is an arithmetic number, because the mean of its divisors is an integer number (6314632384).

Almost surely, 2^25257221107 is an apocalyptic number.

25257221107 is a deficient number, since it is larger than the sum of its proper divisors (1308429).

25257221107 is a wasteful number, since it uses less digits than its factorization.

25257221107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308428.

The product of its (nonzero) digits is 19600, while the sum is 34.

Adding to 25257221107 its reverse (70112275252), we get a palindrome (95369496359).

The spelling of 25257221107 in words is "twenty-five billion, two hundred fifty-seven million, two hundred twenty-one thousand, one hundred seven".