665665875226 has 16 divisors (see below), whose sum is σ = 1089647536320. Its totient is φ = 302470924480.

The previous prime is 665665875113. The next prime is 665665875229. The reversal of 665665875226 is 622578566566.

It is a happy number.

It is a super-2 number, since 2×665665875226² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665665875229) 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, 5158486 + ... + 5285953.

It is an arithmetic number, because the mean of its divisors is an integer number (68102971020).

Almost surely, 2^665665875226 is an apocalyptic number.

665665875226 is a deficient number, since it is larger than the sum of its proper divisors (423981661094).

665665875226 is a wasteful number, since it uses less digits than its factorization.

665665875226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10447349.

The product of its digits is 217728000, while the sum is 64.

The spelling of 665665875226 in words is "six hundred sixty-five billion, six hundred sixty-five million, eight hundred seventy-five thousand, two hundred twenty-six".