26561706648 has 32 divisors (see below), whose sum is σ = 66427268400. Its totient is φ = 8850835328.

The previous prime is 26561706629. The next prime is 26561706667. The reversal of 26561706648 is 84660716562.

It is an interprime number because it is at equal distance from previous prime (26561706629) and next prime (26561706667).

It is a self number, because there is not a number n which added to its sum of digits gives 26561706648.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 120411 + ... + 260042.

Almost surely, 2^26561706648 is an apocalyptic number.

It is an amenable number.

26561706648 is an abundant number, since it is smaller than the sum of its proper divisors (39865561752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26561706648 is a wasteful number, since it uses less digits than its factorization.

26561706648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383371 (or 383367 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 26561706648 in words is "twenty-six billion, five hundred sixty-one million, seven hundred six thousand, six hundred forty-eight".