26216664561021 has 8 divisors (see below), whose sum is σ = 38133330270624. Its totient is φ = 15888887612720.

The previous prime is 26216664560981. The next prime is 26216664561047. The reversal of 26216664561021 is 12016546661262.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 26216664561021 - 2¹⁰ = 26216664559997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26216664511021) 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, 397222190286 + ... + 397222190351.

It is an arithmetic number, because the mean of its divisors is an integer number (4766666283828).

Almost surely, 2^{26216664561021} is an apocalyptic number.

It is an amenable number.

26216664561021 is a deficient number, since it is larger than the sum of its proper divisors (11916665709603).

26216664561021 is a wasteful number, since it uses less digits than its factorization.

26216664561021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794444380651.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 26216664561021 in words is "twenty-six trillion, two hundred sixteen billion, six hundred sixty-four million, five hundred sixty-one thousand, twenty-one".