25513717261 has 6 divisors (see below), whose sum is σ = 25779466410. Its totient is φ = 25250679936.

The previous prime is 25513717253. The next prime is 25513717277. The reversal of 25513717261 is 16271731552.

It can be written as a sum of positive squares in 3 ways, for example, as 2403940900 + 23109776361 = 49030^2 + 152019^2 .

It is not a de Polignac number, because 25513717261 - 2³ = 25513717253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25513717211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1346406 + ... + 1365223.

It is an arithmetic number, because the mean of its divisors is an integer number (4296577735).

Almost surely, 2^25513717261 is an apocalyptic number.

It is an amenable number.

25513717261 is a deficient number, since it is larger than the sum of its proper divisors (265749149).

25513717261 is an frugal number, since it uses more digits than its factorization.

25513717261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2711823 (or 2711726 counting only the distinct ones).

The product of its digits is 88200, while the sum is 40.

The spelling of 25513717261 in words is "twenty-five billion, five hundred thirteen million, seven hundred seventeen thousand, two hundred sixty-one".