25121788213 has 18 divisors (see below), whose sum is σ = 26240764758. Its totient is φ = 24032892240.

The previous prime is 25121788129. The next prime is 25121788231. The reversal of 25121788213 is 31288712152.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24442820964 + 678967249 = 156342^2 + 26057^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25121788213 is a prime.

It is a super-3 number, since 3×25121788213³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25121788513) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 68451556 + ... + 68451922.

Almost surely, 2^25121788213 is an apocalyptic number.

It is an amenable number.

25121788213 is a deficient number, since it is larger than the sum of its proper divisors (1118976545).

25121788213 is an frugal number, since it uses more digits than its factorization.

25121788213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 475 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The spelling of 25121788213 in words is "twenty-five billion, one hundred twenty-one million, seven hundred eighty-eight thousand, two hundred thirteen".