26121646552517 has 2 divisors, whose sum is σ = 26121646552518. Its totient is φ = 26121646552516.

The previous prime is 26121646552511. The next prime is 26121646552537. The reversal of 26121646552517 is 71525564612162.

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., 25317340709956 + 804305842561 = 5031634^2 + 896831^2 .

It is a cyclic number.

It is not a de Polignac number, because 26121646552517 - 2¹⁴ = 26121646536133 is a prime.

It is a super-2 number, since 2×26121646552517² (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 (26121646552511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13060823276258 + 13060823276259.

It is an arithmetic number, because the mean of its divisors is an integer number (13060823276259).

Almost surely, 2^{26121646552517} is an apocalyptic number.

It is an amenable number.

26121646552517 is a deficient number, since it is larger than the sum of its proper divisors (1).

26121646552517 is an equidigital number, since it uses as much as digits as its factorization.

26121646552517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048000, while the sum is 53.

The spelling of 26121646552517 in words is "twenty-six trillion, one hundred twenty-one billion, six hundred forty-six million, five hundred fifty-two thousand, five hundred seventeen".