25541809069 has 16 divisors (see below), whose sum is σ = 31019355648. Its totient is φ = 20530743552.

The previous prime is 25541809049. The next prime is 25541809127. The reversal of 25541809069 is 96090814552.

It is a cyclic number.

It is not a de Polignac number, because 25541809069 - 2¹¹ = 25541807021 is a prime.

It is a super-2 number, since 2×25541809069² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25541809009) 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 15 ways as a sum of consecutive naturals, for example, 354469 + ... + 420394.

It is an arithmetic number, because the mean of its divisors is an integer number (1938709728).

Almost surely, 2^25541809069 is an apocalyptic number.

It is an amenable number.

25541809069 is a deficient number, since it is larger than the sum of its proper divisors (5477546579).

25541809069 is a wasteful number, since it uses less digits than its factorization.

25541809069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775164.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 25541809069 in words is "twenty-five billion, five hundred forty-one million, eight hundred nine thousand, sixty-nine".