655522666 has 8 divisors (see below), whose sum is σ = 987504804. Its totient is φ = 326354400.

The previous prime is 655522663. The next prime is 655522691. The reversal of 655522666 is 666225556.

It can be written as a sum of positive squares in 2 ways, for example, as 601279441 + 54243225 = 24521^2 + 7365^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (655522663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702885 + ... + 703816.

Almost surely, 2^655522666 is an apocalyptic number.

655522666 is a deficient number, since it is larger than the sum of its proper divisors (331982138).

655522666 is a wasteful number, since it uses less digits than its factorization.

655522666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406936.

The product of its digits is 648000, while the sum is 43.

The square root of 655522666 is about 25603.1768731929. The cubic root of 655522666 is about 868.6854971622.

The spelling of 655522666 in words is "six hundred fifty-five million, five hundred twenty-two thousand, six hundred sixty-six".