25045172172 has 72 divisors (see below), whose sum is σ = 63578236176. Its totient is φ = 8312920704.

The previous prime is 25045172171. The next prime is 25045172189. The reversal of 25045172172 is 27127154052.

25045172172 is a `hidden beast` number, since 2 + 50 + 4 + 517 + 21 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25045172171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11046583 + ... + 11048849.

It is an arithmetic number, because the mean of its divisors is an integer number (883031058).

Almost surely, 2^25045172172 is an apocalyptic number.

It is an amenable number.

25045172172 is an abundant number, since it is smaller than the sum of its proper divisors (38533064004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25045172172 is a wasteful number, since it uses less digits than its factorization.

25045172172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447 (or 3442 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The spelling of 25045172172 in words is "twenty-five billion, forty-five million, one hundred seventy-two thousand, one hundred seventy-two".