327901987745681 has 2 divisors, whose sum is σ = 327901987745682. Its totient is φ = 327901987745680.

The previous prime is 327901987745671. The next prime is 327901987745701. The reversal of 327901987745681 is 186547789109723.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 288234148051600 + 39667839694081 = 16977460^2 + 6298241^2 .

It is an emirp because it is prime and its reverse (186547789109723) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 327901987745681 - 2¹⁰ = 327901987744657 is a prime.

It is a super-2 number, since 2×327901987745681² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (327901987745611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163950993872840 + 163950993872841.

It is an arithmetic number, because the mean of its divisors is an integer number (163950993872841).

It is a 2-persistent number, because it is pandigital, and so is 2⋅327901987745681 = 655803975491362, but 3⋅327901987745681 = 983705963237043 is not.

Almost surely, 2^{327901987745681} is an apocalyptic number.

It is an amenable number.

327901987745681 is a deficient number, since it is larger than the sum of its proper divisors (1).

327901987745681 is an equidigital number, since it uses as much as digits as its factorization.

327901987745681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280240640, while the sum is 77.

The spelling of 327901987745681 in words is "three hundred twenty-seven trillion, nine hundred one billion, nine hundred eighty-seven million, seven hundred forty-five thousand, six hundred eighty-one".