25520172231 has 16 divisors (see below), whose sum is σ = 35725622400. Its totient is φ = 16181598048.

The previous prime is 25520172193. The next prime is 25520172257. The reversal of 25520172231 is 13227102552.

It is not a de Polignac number, because 25520172231 - 2¹¹ = 25520170183 is a prime.

It is a super-2 number, since 2×25520172231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25520172131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2183241 + ... + 2194898.

It is an arithmetic number, because the mean of its divisors is an integer number (2232851400).

Almost surely, 2^25520172231 is an apocalyptic number.

25520172231 is a deficient number, since it is larger than the sum of its proper divisors (10205450169).

25520172231 is a wasteful number, since it uses less digits than its factorization.

25520172231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378238.

The product of its (nonzero) digits is 8400, while the sum is 30.

Adding to 25520172231 its reverse (13227102552), we get a palindrome (38747274783).

The spelling of 25520172231 in words is "twenty-five billion, five hundred twenty million, one hundred seventy-two thousand, two hundred thirty-one".