26561100875640 has 64 divisors (see below), whose sum is σ = 79685800306560. Its totient is φ = 7082738217600.

The previous prime is 26561100875557. The next prime is 26561100875657. The reversal of 26561100875640 is 4657800116562.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393147 + ... + 7299093.

It is an arithmetic number, because the mean of its divisors is an integer number (1245090629790).

Almost surely, 2^{26561100875640} is an apocalyptic number.

26561100875640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26561100875640 is an abundant number, since it is smaller than the sum of its proper divisors (53124699430920).

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

26561100875640 is a wasteful number, since it uses less digits than its factorization.

26561100875640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938012 (or 6938008 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 26561100875640 in words is "twenty-six trillion, five hundred sixty-one billion, one hundred million, eight hundred seventy-five thousand, six hundred forty".