26451560521 has 2 divisors, whose sum is σ = 26451560522. Its totient is φ = 26451560520.

The previous prime is 26451560519. The next prime is 26451560593. The reversal of 26451560521 is 12506515462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26450468496 + 1092025 = 162636^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 26451560521 - 2¹ = 26451560519 is a prime.

It is a super-2 number, since 2×26451560521² (a number of 22 digits) contains 22 as substring.

Together with 26451560519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26451560321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13225780260 + 13225780261.

It is an arithmetic number, because the mean of its divisors is an integer number (13225780261).

Almost surely, 2^26451560521 is an apocalyptic number.

It is an amenable number.

26451560521 is a deficient number, since it is larger than the sum of its proper divisors (1).

26451560521 is an equidigital number, since it uses as much as digits as its factorization.

26451560521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 26451560521 in words is "twenty-six billion, four hundred fifty-one million, five hundred sixty thousand, five hundred twenty-one".