305607661 has 4 divisors (see below), whose sum is σ = 305863324. Its totient is φ = 305352000.

The previous prime is 305607649. The next prime is 305607671. The reversal of 305607661 is 166706503.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166706503 = 4139 ⋅40277.

It can be written as a sum of positive squares in 2 ways, for example, as 5244100 + 300363561 = 2290^2 + 17331^2 .

It is a cyclic number.

It is not a de Polignac number, because 305607661 - 2¹¹ = 305605613 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 (305607671) 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, 126030 + ... + 128431.

It is an arithmetic number, because the mean of its divisors is an integer number (76465831).

Almost surely, 2^305607661 is an apocalyptic number.

It is an amenable number.

305607661 is a deficient number, since it is larger than the sum of its proper divisors (255663).

305607661 is a wasteful number, since it uses less digits than its factorization.

305607661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255662.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 305607661 is about 17481.6378237281. The cubic root of 305607661 is about 673.5782868260.

The spelling of 305607661 in words is "three hundred five million, six hundred seven thousand, six hundred sixty-one".