666225560 has 192 divisors, whose sum is σ = 2049455520. Its totient is φ = 191600640.

The previous prime is 666225559. The next prime is 666225583. The reversal of 666225560 is 65522666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 279092 + ... + 281468.

Almost surely, 2^666225560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666225560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024727760).

666225560 is an abundant number, since it is smaller than the sum of its proper divisors (1383229960).

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

666225560 is a wasteful number, since it uses less digits than its factorization.

666225560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2415 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 666225560 is about 25811.3455674050. The cubic root of 666225560 is about 873.3877511430.

The spelling of 666225560 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred sixty".