220707661 has 4 divisors (see below), whose sum is σ = 228318300. Its totient is φ = 213097024.

The previous prime is 220707649. The next prime is 220707673. The reversal of 220707661 is 166707022.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (220707649) and next prime (220707673).

It can be written as a sum of positive squares in 2 ways, for example, as 103938025 + 116769636 = 10195^2 + 10806^2 .

It is a cyclic number.

It is not a de Polignac number, because 220707661 - 2¹³ = 220699469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220707761) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3805276 + ... + 3805333.

It is an arithmetic number, because the mean of its divisors is an integer number (57079575).

Almost surely, 2^220707661 is an apocalyptic number.

It is an amenable number.

220707661 is a deficient number, since it is larger than the sum of its proper divisors (7610639).

220707661 is an equidigital number, since it uses as much as digits as its factorization.

220707661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7610638.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 220707661 is about 14856.2330689849. The cubic root of 220707661 is about 604.3276559794.

The spelling of 220707661 in words is "two hundred twenty million, seven hundred seven thousand, six hundred sixty-one".