25780830644078 has 4 divisors (see below), whose sum is σ = 38671245966120. Its totient is φ = 12890415322038.

The previous prime is 25780830644039. The next prime is 25780830644083. The reversal of 25780830644078 is 87044603808752.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25780830644078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445207661018 + ... + 6445207661021.

It is an arithmetic number, because the mean of its divisors is an integer number (9667811491530).

Almost surely, 2^{25780830644078} is an apocalyptic number.

25780830644078 is a deficient number, since it is larger than the sum of its proper divisors (12890415322042).

25780830644078 is a wasteful number, since it uses less digits than its factorization.

25780830644078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12890415322041.

The product of its (nonzero) digits is 72253440, while the sum is 62.

The spelling of 25780830644078 in words is "twenty-five trillion, seven hundred eighty billion, eight hundred thirty million, six hundred forty-four thousand, seventy-eight".