25858247993 has 2 divisors, whose sum is σ = 25858247994. Its totient is φ = 25858247992.

The previous prime is 25858247981. The next prime is 25858248001. The reversal of 25858247993 is 39974285852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25539875344 + 318372649 = 159812^2 + 17843^2 .

It is a cyclic number.

It is not a de Polignac number, because 25858247993 - 2⁴ = 25858247977 is a prime.

It is not a weakly prime, because it can be changed into another prime (25855247993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12929123996 + 12929123997.

It is an arithmetic number, because the mean of its divisors is an integer number (12929123997).

Almost surely, 2^25858247993 is an apocalyptic number.

It is an amenable number.

25858247993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25858247993 is an equidigital number, since it uses as much as digits as its factorization.

25858247993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 62.

The spelling of 25858247993 in words is "twenty-five billion, eight hundred fifty-eight million, two hundred forty-seven thousand, nine hundred ninety-three".