25161012 has 36 divisors (see below), whose sum is σ = 64324260. Its totient is φ = 8291712.

The previous prime is 25161001. The next prime is 25161013. The reversal of 25161012 is 21016152.

25161012 is a `hidden beast` number, since 2 + 51 + 610 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2178576 + 22982436 = 1476^2 + 4794^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25161013) 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 11 ways as a sum of consecutive naturals, for example, 723 + ... + 7130.

It is an arithmetic number, because the mean of its divisors is an integer number (1786785).

Almost surely, 2^25161012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25161012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32162130).

25161012 is an abundant number, since it is smaller than the sum of its proper divisors (39163248).

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

25161012 is a wasteful number, since it uses less digits than its factorization.

25161012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7952 (or 7947 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 25161012 is about 5016.0753582856. The cubic root of 25161012 is about 293.0281669078.

Adding to 25161012 its reverse (21016152), we get a palindrome (46177164).

The spelling of 25161012 in words is "twenty-five million, one hundred sixty-one thousand, twelve".