25172051101 has 4 divisors (see below), whose sum is σ = 25526587104. Its totient is φ = 24817515100.

The previous prime is 25172051089. The next prime is 25172051117. The reversal of 25172051101 is 10115027152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25172051101 - 2²³ = 25163662493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25172051131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177267895 + ... + 177268036.

It is an arithmetic number, because the mean of its divisors is an integer number (6381646776).

Almost surely, 2^25172051101 is an apocalyptic number.

It is an amenable number.

25172051101 is a deficient number, since it is larger than the sum of its proper divisors (354536003).

25172051101 is an equidigital number, since it uses as much as digits as its factorization.

25172051101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354536002.

The product of its (nonzero) digits is 700, while the sum is 25.

Adding to 25172051101 its reverse (10115027152), we get a palindrome (35287078253).

The spelling of 25172051101 in words is "twenty-five billion, one hundred seventy-two million, fifty-one thousand, one hundred one".