25125553121 has 4 divisors (see below), whose sum is σ = 26603526852. Its totient is φ = 23647579392.

The previous prime is 25125553099. The next prime is 25125553151. The reversal of 25125553121 is 12135552152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22970736721 + 2154816400 = 151561^2 + 46420^2 .

It is a cyclic number.

It is not a de Polignac number, because 25125553121 - 2²² = 25121358817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25125553151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738986840 + ... + 738986873.

It is an arithmetic number, because the mean of its divisors is an integer number (6650881713).

Almost surely, 2^25125553121 is an apocalyptic number.

It is an amenable number.

25125553121 is a deficient number, since it is larger than the sum of its proper divisors (1477973731).

25125553121 is a wasteful number, since it uses less digits than its factorization.

25125553121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477973730.

The product of its digits is 15000, while the sum is 32.

The spelling of 25125553121 in words is "twenty-five billion, one hundred twenty-five million, five hundred fifty-three thousand, one hundred twenty-one".