327901806561 has 32 divisors (see below), whose sum is σ = 542924185600. Its totient is φ = 171784592640.

The previous prime is 327901806559. The next prime is 327901806629. The reversal of 327901806561 is 165608109723.

It is not a de Polignac number, because 327901806561 - 2¹ = 327901806559 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 327901806561.

It is not an unprimeable number, because it can be changed into a prime (327901806961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13242616 + ... + 13267353.

It is an arithmetic number, because the mean of its divisors is an integer number (16966380800).

Almost surely, 2^327901806561 is an apocalyptic number.

327901806561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

327901806561 is a deficient number, since it is larger than the sum of its proper divisors (215022379039).

327901806561 is a wasteful number, since it uses less digits than its factorization.

327901806561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26510029.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 327901806561 in words is "three hundred twenty-seven billion, nine hundred one million, eight hundred six thousand, five hundred sixty-one".