666225558 has 24 divisors (see below), whose sum is σ = 1444185288. Its totient is φ = 221968032.

The previous prime is 666225509. The next prime is 666225559. The reversal of 666225558 is 855522666.

It is a super-3 number, since 3×666225558³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666225559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35341 + ... + 50807.

It is an arithmetic number, because the mean of its divisors is an integer number (60174387).

Almost surely, 2^666225558 is an apocalyptic number.

666225558 is an abundant number, since it is smaller than the sum of its proper divisors (777959730).

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

666225558 is a wasteful number, since it uses less digits than its factorization.

666225558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17868 (or 17865 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 666225558 is about 25811.3455286624. The cubic root of 666225558 is about 873.3877502690.

The spelling of 666225558 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred fifty-eight".