25516665277489 has 2 divisors, whose sum is σ = 25516665277490. Its totient is φ = 25516665277488.

The previous prime is 25516665277447. The next prime is 25516665277541. The reversal of 25516665277489 is 98477256661552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23841149907600 + 1675515369889 = 4882740^2 + 1294417^2 .

It is a cyclic number.

It is not a de Polignac number, because 25516665277489 - 2¹³ = 25516665269297 is a prime.

It is a super-2 number, since 2×25516665277489² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25516665277289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12758332638744 + 12758332638745.

It is an arithmetic number, because the mean of its divisors is an integer number (12758332638745).

Almost surely, 2^{25516665277489} is an apocalyptic number.

It is an amenable number.

25516665277489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25516665277489 is an equidigital number, since it uses as much as digits as its factorization.

25516665277489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096000, while the sum is 73.

The spelling of 25516665277489 in words is "twenty-five trillion, five hundred sixteen billion, six hundred sixty-five million, two hundred seventy-seven thousand, four hundred eighty-nine".