25747506640517 has 2 divisors, whose sum is σ = 25747506640518. Its totient is φ = 25747506640516.

The previous prime is 25747506640507. The next prime is 25747506640549. The reversal of 25747506640517 is 71504660574752.

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., 17378109714436 + 8369396926081 = 4168706^2 + 2892991^2 .

It is a cyclic number.

It is not a de Polignac number, because 25747506640517 - 2³⁶ = 25678787163781 is a prime.

It is a super-2 number, since 2×25747506640517² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25747506640507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12873753320258 + 12873753320259.

It is an arithmetic number, because the mean of its divisors is an integer number (12873753320259).

Almost surely, 2^{25747506640517} is an apocalyptic number.

It is an amenable number.

25747506640517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25747506640517 is an equidigital number, since it uses as much as digits as its factorization.

25747506640517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392000, while the sum is 59.

The spelling of 25747506640517 in words is "twenty-five trillion, seven hundred forty-seven billion, five hundred six million, six hundred forty thousand, five hundred seventeen".