25121554513 has 12 divisors (see below), whose sum is σ = 27798290100. Its totient is φ = 22684486880.

The previous prime is 25121554489. The next prime is 25121554559. The reversal of 25121554513 is 31545512152.

It can be written as a sum of positive squares in 2 ways, for example, as 3420729169 + 21700825344 = 58487^2 + 147312^2 .

It is not a de Polignac number, because 25121554513 - 2¹⁷ = 25121423441 is a prime.

It is a super-2 number, since 2×25121554513² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25121554583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678670 + ... + 714727.

It is an arithmetic number, because the mean of its divisors is an integer number (2316524175).

Almost surely, 2^25121554513 is an apocalyptic number.

It is an amenable number.

25121554513 is a deficient number, since it is larger than the sum of its proper divisors (2676735587).

25121554513 is a wasteful number, since it uses less digits than its factorization.

25121554513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393568 (or 1393557 counting only the distinct ones).

The product of its digits is 30000, while the sum is 34.

The spelling of 25121554513 in words is "twenty-five billion, one hundred twenty-one million, five hundred fifty-four thousand, five hundred thirteen".