326661661 has 4 divisors (see below), whose sum is σ = 343854400. Its totient is φ = 309468924.

The previous prime is 326661619. The next prime is 326661667. The reversal of 326661661 is 166166623.

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.

It is a cyclic number.

It is not a de Polignac number, because 326661661 - 2⁹ = 326661149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 326661661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (326661667) 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, 8596341 + ... + 8596378.

It is an arithmetic number, because the mean of its divisors is an integer number (85963600).

Almost surely, 2^326661661 is an apocalyptic number.

It is an amenable number.

326661661 is a deficient number, since it is larger than the sum of its proper divisors (17192739).

326661661 is a wasteful number, since it uses less digits than its factorization.

326661661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17192738.

The product of its digits is 46656, while the sum is 37.

The square root of 326661661 is about 18073.7838041734. The cubic root of 326661661 is about 688.7041849492.

The spelling of 326661661 in words is "three hundred twenty-six million, six hundred sixty-one thousand, six hundred sixty-one".