26457725717 has 2 divisors, whose sum is σ = 26457725718. Its totient is φ = 26457725716.

The previous prime is 26457725689. The next prime is 26457725741. The reversal of 26457725717 is 71752775462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25919068036 + 538657681 = 160994^2 + 23209^2 .

It is a cyclic number.

It is not a de Polignac number, because 26457725717 - 2⁶ = 26457725653 is a prime.

It is a super-2 number, since 2×26457725717² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26457725797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13228862858 + 13228862859.

It is an arithmetic number, because the mean of its divisors is an integer number (13228862859).

Almost surely, 2^26457725717 is an apocalyptic number.

It is an amenable number.

26457725717 is a deficient number, since it is larger than the sum of its proper divisors (1).

26457725717 is an equidigital number, since it uses as much as digits as its factorization.

26457725717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5762400, while the sum is 53.

The spelling of 26457725717 in words is "twenty-six billion, four hundred fifty-seven million, seven hundred twenty-five thousand, seven hundred seventeen".