25758325782779 has 4 divisors (see below), whose sum is σ = 25758340596984. Its totient is φ = 25758310968576.

The previous prime is 25758325782667. The next prime is 25758325782793. The reversal of 25758325782779 is 97728752385752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25758325782779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25758325785779) 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, 4389062 + ... + 8413115.

It is an arithmetic number, because the mean of its divisors is an integer number (6439585149246).

Almost surely, 2^{25758325782779} is an apocalyptic number.

25758325782779 is a deficient number, since it is larger than the sum of its proper divisors (14814205).

25758325782779 is a wasteful number, since it uses less digits than its factorization.

25758325782779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14814204.

The product of its digits is 4148928000, while the sum is 77.

The spelling of 25758325782779 in words is "twenty-five trillion, seven hundred fifty-eight billion, three hundred twenty-five million, seven hundred eighty-two thousand, seven hundred seventy-nine".