326535661 has 4 divisors (see below), whose sum is σ = 326575552. Its totient is φ = 326495772.

The previous prime is 326535637. The next prime is 326535667. The reversal of 326535661 is 166535623.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 166535623 = 1451 ⋅114773.

It is a cyclic number.

It is not a de Polignac number, because 326535661 - 2⁷ = 326535533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 326535661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326535667) 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, 2691 + ... + 25696.

It is an arithmetic number, because the mean of its divisors is an integer number (81643888).

Almost surely, 2^326535661 is an apocalyptic number.

It is an amenable number.

326535661 is a deficient number, since it is larger than the sum of its proper divisors (39891).

326535661 is a wasteful number, since it uses less digits than its factorization.

326535661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39890.

The product of its digits is 97200, while the sum is 37.

The square root of 326535661 is about 18070.2977562629. The cubic root of 326535661 is about 688.6156245239.

The spelling of 326535661 in words is "three hundred twenty-six million, five hundred thirty-five thousand, six hundred sixty-one".