25492021993 has 2 divisors, whose sum is σ = 25492021994. Its totient is φ = 25492021992.

The previous prime is 25492021981. The next prime is 25492022027. The reversal of 25492021993 is 39912029452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24732909289 + 759112704 = 157267^2 + 27552^2 .

It is a cyclic number.

It is not a de Polignac number, because 25492021993 - 2⁹ = 25492021481 is a prime.

It is not a weakly prime, because it can be changed into another prime (25492021493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746010996 + 12746010997.

It is an arithmetic number, because the mean of its divisors is an integer number (12746010997).

Almost surely, 2^25492021993 is an apocalyptic number.

It is an amenable number.

25492021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25492021993 is an equidigital number, since it uses as much as digits as its factorization.

25492021993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 25492021993 in words is "twenty-five billion, four hundred ninety-two million, twenty-one thousand, nine hundred ninety-three".