666225555 has 32 divisors (see below), whose sum is σ = 1119225600. Its totient is φ = 337932672.

The previous prime is 666225509. The next prime is 666225559. The reversal of 666225555 is 555522666.

It is not a de Polignac number, because 666225555 - 2¹¹ = 666223507 is a prime.

It is a zygodrome in base 10.

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 31 ways as a sum of consecutive naturals, for example, 17716 + ... + 40574.

It is an arithmetic number, because the mean of its divisors is an integer number (34975800).

Almost surely, 2^666225555 is an apocalyptic number.

666225555 is a deficient number, since it is larger than the sum of its proper divisors (453000045).

666225555 is a wasteful number, since it uses less digits than its factorization.

666225555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22963.

The product of its digits is 540000, while the sum is 42.

The square root of 666225555 is about 25811.3454705484. The cubic root of 666225555 is about 873.3877489581.

The spelling of 666225555 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred fifty-five".