26521980657 has 32 divisors (see below), whose sum is σ = 36662957184. Its totient is φ = 17042227200.

The previous prime is 26521980649. The next prime is 26521980691. The reversal of 26521980657 is 75608912562.

It is not a de Polignac number, because 26521980657 - 2³ = 26521980649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26521980647) 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 31 ways as a sum of consecutive naturals, for example, 8242713 + ... + 8245929.

It is an arithmetic number, because the mean of its divisors is an integer number (1145717412).

Almost surely, 2^26521980657 is an apocalyptic number.

It is an amenable number.

26521980657 is a deficient number, since it is larger than the sum of its proper divisors (10140976527).

26521980657 is a wasteful number, since it uses less digits than its factorization.

26521980657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049.

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 26521980657 in words is "twenty-six billion, five hundred twenty-one million, nine hundred eighty thousand, six hundred fifty-seven".