26665216722 has 24 divisors (see below), whose sum is σ = 57803616000. Its totient is φ = 8883947160.

The previous prime is 26665216709. The next prime is 26665216733. The reversal of 26665216722 is 22761256662.

It is a super-2 number, since 2×26665216722² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 334554 + ... + 406517.

It is an arithmetic number, because the mean of its divisors is an integer number (2408484000).

Almost surely, 2^26665216722 is an apocalyptic number.

26665216722 is an abundant number, since it is smaller than the sum of its proper divisors (31138399278).

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

26665216722 is a wasteful number, since it uses less digits than its factorization.

26665216722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743078 (or 743075 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The spelling of 26665216722 in words is "twenty-six billion, six hundred sixty-five million, two hundred sixteen thousand, seven hundred twenty-two".