25947393866 has 4 divisors (see below), whose sum is σ = 38921090802. Its totient is φ = 12973696932.

The previous prime is 25947393853. The next prime is 25947393877. The reversal of 25947393866 is 66839374952.

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

It can be written as a sum of positive squares in only one way, i.e., 13014018241 + 12933375625 = 114079^2 + 113725^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25947393799 and 25947393808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6486848465 + ... + 6486848468.

Almost surely, 2^25947393866 is an apocalyptic number.

25947393866 is a deficient number, since it is larger than the sum of its proper divisors (12973696936).

25947393866 is a wasteful number, since it uses less digits than its factorization.

25947393866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973696935.

The product of its digits is 58786560, while the sum is 62.

The spelling of 25947393866 in words is "twenty-five billion, nine hundred forty-seven million, three hundred ninety-three thousand, eight hundred sixty-six".