326440136561 has 32 divisors (see below), whose sum is σ = 428699520000. Its totient is φ = 240818719680.

The previous prime is 326440136513. The next prime is 326440136573. The reversal of 326440136561 is 165631044623.

It is not a de Polignac number, because 326440136561 - 2¹⁸ = 326439874417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (326440136461) 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 31 ways as a sum of consecutive naturals, for example, 2118611 + ... + 2267463.

It is an arithmetic number, because the mean of its divisors is an integer number (13396860000).

Almost surely, 2^326440136561 is an apocalyptic number.

It is an amenable number.

326440136561 is a deficient number, since it is larger than the sum of its proper divisors (102259383439).

326440136561 is a wasteful number, since it uses less digits than its factorization.

326440136561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150389.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 326440136561 in words is "three hundred twenty-six billion, four hundred forty million, one hundred thirty-six thousand, five hundred sixty-one".