26663016021 has 16 divisors (see below), whose sum is σ = 37245216768. Its totient is φ = 16945196400.

The previous prime is 26663016013. The next prime is 26663016043. The reversal of 26663016021 is 12061036662.

It is not a de Polignac number, because 26663016021 - 2³ = 26663016013 is a prime.

It is a super-2 number, since 2×26663016021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26663016091) 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 15 ways as a sum of consecutive naturals, for example, 2133315 + ... + 2145776.

It is an arithmetic number, because the mean of its divisors is an integer number (2327826048).

Almost surely, 2^26663016021 is an apocalyptic number.

It is an amenable number.

26663016021 is a deficient number, since it is larger than the sum of its proper divisors (10582200747).

26663016021 is a wasteful number, since it uses less digits than its factorization.

26663016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279192.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 26663016021 in words is "twenty-six billion, six hundred sixty-three million, sixteen thousand, twenty-one".