25709065493 has 2 divisors, whose sum is σ = 25709065494. Its totient is φ = 25709065492.

The previous prime is 25709065489. The next prime is 25709065517. The reversal of 25709065493 is 39456090752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25250163409 + 458902084 = 158903^2 + 21422^2 .

It is a cyclic number.

It is not a de Polignac number, because 25709065493 - 2² = 25709065489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25709065453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854532746 + 12854532747.

It is an arithmetic number, because the mean of its divisors is an integer number (12854532747).

Almost surely, 2^25709065493 is an apocalyptic number.

It is an amenable number.

25709065493 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709065493 is an equidigital number, since it uses as much as digits as its factorization.

25709065493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 25709065493 in words is "twenty-five billion, seven hundred nine million, sixty-five thousand, four hundred ninety-three".