3984646882561 has 2 divisors, whose sum is σ = 3984646882562. Its totient is φ = 3984646882560.

The previous prime is 3984646882477. The next prime is 3984646882613. The reversal of 3984646882561 is 1652886464893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2281138998336 + 1703507884225 = 1510344^2 + 1305185^2 .

It is a cyclic number.

It is not a de Polignac number, because 3984646882561 - 2²⁷ = 3984512664833 is a prime.

It is not a weakly prime, because it can be changed into another prime (3984646882861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992323441280 + 1992323441281.

It is an arithmetic number, because the mean of its divisors is an integer number (1992323441281).

Almost surely, 2^{3984646882561} is an apocalyptic number.

It is an amenable number.

3984646882561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3984646882561 is an equidigital number, since it uses as much as digits as its factorization.

3984646882561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 477757440, while the sum is 70.

The spelling of 3984646882561 in words is "three trillion, nine hundred eighty-four billion, six hundred forty-six million, eight hundred eighty-two thousand, five hundred sixty-one".