26563136641 has 8 divisors (see below), whose sum is σ = 27630930600. Its totient is φ = 25505464320.

The previous prime is 26563136627. The next prime is 26563136651. The reversal of 26563136641 is 14663136562.

It can be written as a sum of positive squares in 4 ways, for example, as 1964351041 + 24598785600 = 44321^2 + 156840^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26563136641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26563136651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2525056 + ... + 2535553.

It is an arithmetic number, because the mean of its divisors is an integer number (3453866325).

Almost surely, 2^26563136641 is an apocalyptic number.

It is an amenable number.

26563136641 is a deficient number, since it is larger than the sum of its proper divisors (1067793959).

26563136641 is a wasteful number, since it uses less digits than its factorization.

26563136641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060819.

The product of its digits is 466560, while the sum is 43.

The spelling of 26563136641 in words is "twenty-six billion, five hundred sixty-three million, one hundred thirty-six thousand, six hundred forty-one".