26645616497 has 2 divisors, whose sum is σ = 26645616498. Its totient is φ = 26645616496.

The previous prime is 26645616467. The next prime is 26645616551. The reversal of 26645616497 is 79461654662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21588131041 + 5057485456 = 146929^2 + 71116^2 .

It is a cyclic number.

It is not a de Polignac number, because 26645616497 - 2³² = 22350649201 is a prime.

It is not a weakly prime, because it can be changed into another prime (26645616427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13322808248 + 13322808249.

It is an arithmetic number, because the mean of its divisors is an integer number (13322808249).

Almost surely, 2^26645616497 is an apocalyptic number.

It is an amenable number.

26645616497 is a deficient number, since it is larger than the sum of its proper divisors (1).

26645616497 is an equidigital number, since it uses as much as digits as its factorization.

26645616497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 56.

The spelling of 26645616497 in words is "twenty-six billion, six hundred forty-five million, six hundred sixteen thousand, four hundred ninety-seven".