26505623720 has 32 divisors (see below), whose sum is σ = 61561451520. Its totient is φ = 10260240960.

The previous prime is 26505623719. The next prime is 26505623723. The reversal of 26505623720 is 2732650562.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (26505623723) 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 in 7 ways as a sum of consecutive naturals, for example, 10686512 + ... + 10688991.

It is an arithmetic number, because the mean of its divisors is an integer number (1923795360).

Almost surely, 2^26505623720 is an apocalyptic number.

26505623720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26505623720 is an abundant number, since it is smaller than the sum of its proper divisors (35055827800).

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

26505623720 is a wasteful number, since it uses less digits than its factorization.

26505623720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21375545 (or 21375541 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 38.

The spelling of 26505623720 in words is "twenty-six billion, five hundred five million, six hundred twenty-three thousand, seven hundred twenty".