220661306 has 4 divisors (see below), whose sum is σ = 330991962. Its totient is φ = 110330652.

The previous prime is 220661281. The next prime is 220661347. The reversal of 220661306 is 603166022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 603166022 = 2 ⋅301583011.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 96138025 = 11159^2 + 9805^2 .

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 as a sum of consecutive naturals, namely, 55165325 + ... + 55165328.

Almost surely, 2^220661306 is an apocalyptic number.

220661306 is a deficient number, since it is larger than the sum of its proper divisors (110330656).

220661306 is a wasteful number, since it uses less digits than its factorization.

220661306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110330655.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 220661306 is about 14854.6728674852. The cubic root of 220661306 is about 604.2853442478.

The spelling of 220661306 in words is "two hundred twenty million, six hundred sixty-one thousand, three hundred six".