326133508561 has 27 divisors (see below), whose sum is σ = 403092982299. Its totient is φ = 263044477248.

The previous prime is 326133508541. The next prime is 326133508567. The reversal of 326133508561 is 165805331623.

It is a happy number.

The square root of 326133508561 is 571081.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 253910171025 + 72223337536 = 503895^2 + 268744^2 .

It is not a de Polignac number, because 326133508561 - 2¹⁹ = 326132984273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (326133508567) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 67956240 + ... + 67961038.

Almost surely, 2^326133508561 is an apocalyptic number.

326133508561 is the 571081-st square number.

326133508561 is the 285541-st centered octagonal number.

It is an amenable number.

326133508561 is a deficient number, since it is larger than the sum of its proper divisors (76959473738).

326133508561 is an frugal number, since it uses more digits than its factorization.

326133508561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9646 (or 4823 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The spelling of 326133508561 in words is "three hundred twenty-six billion, one hundred thirty-three million, five hundred eight thousand, five hundred sixty-one".