220666506 has 8 divisors (see below), whose sum is σ = 441333024. Its totient is φ = 73555500.

The previous prime is 220666493. The next prime is 220666529. The reversal of 220666506 is 605666022.

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

220666506 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18388870 + ... + 18388881.

It is an arithmetic number, because the mean of its divisors is an integer number (55166628).

Almost surely, 2^220666506 is an apocalyptic number.

220666506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220666506 is a wasteful number, since it uses less digits than its factorization.

220666506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36777756.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 220666506 is about 14854.8478955525. The cubic root of 220666506 is about 604.2900909781.

The spelling of 220666506 in words is "two hundred twenty million, six hundred sixty-six thousand, five hundred six".