326803661 has 4 divisors (see below), whose sum is σ = 334774524. Its totient is φ = 318832800.

The previous prime is 326803567. The next prime is 326803663. The reversal of 326803661 is 166308623.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166308623 = 13 ⋅12792971.

It can be written as a sum of positive squares in 2 ways, for example, as 125305636 + 201498025 = 11194^2 + 14195^2 .

It is a cyclic number.

It is not a de Polignac number, because 326803661 - 2¹⁸ = 326541517 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 (326803663) 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, 3985370 + ... + 3985451.

It is an arithmetic number, because the mean of its divisors is an integer number (83693631).

Almost surely, 2^326803661 is an apocalyptic number.

It is an amenable number.

326803661 is a deficient number, since it is larger than the sum of its proper divisors (7970863).

326803661 is an equidigital number, since it uses as much as digits as its factorization.

326803661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7970862.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 326803661 is about 18077.7117191308. The cubic root of 326803661 is about 688.8039638527.

The spelling of 326803661 in words is "three hundred twenty-six million, eight hundred three thousand, six hundred sixty-one".