25705645757 has 4 divisors (see below), whose sum is σ = 28042522656. Its totient is φ = 23368768860.

The previous prime is 25705645747. The next prime is 25705645781. The reversal of 25705645757 is 75754650752.

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 25705645757 - 2¹⁴ = 25705629373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25705645699 and 25705645708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25705645727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1168438433 + ... + 1168438454.

It is an arithmetic number, because the mean of its divisors is an integer number (7010630664).

Almost surely, 2^25705645757 is an apocalyptic number.

It is an amenable number.

25705645757 is a deficient number, since it is larger than the sum of its proper divisors (2336876899).

25705645757 is a wasteful number, since it uses less digits than its factorization.

25705645757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336876898.

The product of its (nonzero) digits is 10290000, while the sum is 53.

The spelling of 25705645757 in words is "twenty-five billion, seven hundred five million, six hundred forty-five thousand, seven hundred fifty-seven".