25678734943 has 2 divisors, whose sum is σ = 25678734944. Its totient is φ = 25678734942.

The previous prime is 25678734919. The next prime is 25678735007. The reversal of 25678734943 is 34943787652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25678734943 - 2¹³ = 25678726751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25678732943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12839367471 + 12839367472.

It is an arithmetic number, because the mean of its divisors is an integer number (12839367472).

Almost surely, 2^25678734943 is an apocalyptic number.

25678734943 is a deficient number, since it is larger than the sum of its proper divisors (1).

25678734943 is an equidigital number, since it uses as much as digits as its factorization.

25678734943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 58.

It can be divided in two parts, 2567873 and 4943, that added together give a square (2572816 = 1604²).

The spelling of 25678734943 in words is "twenty-five billion, six hundred seventy-eight million, seven hundred thirty-four thousand, nine hundred forty-three".