25251121541 has 8 divisors (see below), whose sum is σ = 26123666520. Its totient is φ = 24378697728.

The previous prime is 25251121523. The next prime is 25251121603. The reversal of 25251121541 is 14512115252.

It can be written as a sum of positive squares in 4 ways, for example, as 13705619041 + 11545502500 = 117071^2 + 107450^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25251121541 - 2¹⁴ = 25251105157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25251124541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662885 + ... + 699941.

It is an arithmetic number, because the mean of its divisors is an integer number (3265458315).

Almost surely, 2^25251121541 is an apocalyptic number.

It is an amenable number.

25251121541 is a deficient number, since it is larger than the sum of its proper divisors (872544979).

25251121541 is a wasteful number, since it uses less digits than its factorization.

25251121541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60583.

The product of its digits is 4000, while the sum is 29.

Adding to 25251121541 its reverse (14512115252), we get a palindrome (39763236793).

The spelling of 25251121541 in words is "twenty-five billion, two hundred fifty-one million, one hundred twenty-one thousand, five hundred forty-one".