25545980769 has 4 divisors (see below), whose sum is σ = 34061307696. Its totient is φ = 17030653844.

The previous prime is 25545980753. The next prime is 25545980773. The reversal of 25545980769 is 96708954552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25545980769 - 2⁴ = 25545980753 is a prime.

It is a super-2 number, since 2×25545980769² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25545980069) 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 3 ways as a sum of consecutive naturals, for example, 4257663459 + ... + 4257663464.

It is an arithmetic number, because the mean of its divisors is an integer number (8515326924).

Almost surely, 2^25545980769 is an apocalyptic number.

It is an amenable number.

25545980769 is a deficient number, since it is larger than the sum of its proper divisors (8515326927).

25545980769 is an equidigital number, since it uses as much as digits as its factorization.

25545980769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8515326926.

The product of its (nonzero) digits is 27216000, while the sum is 60.

The spelling of 25545980769 in words is "twenty-five billion, five hundred forty-five million, nine hundred eighty thousand, seven hundred sixty-nine".