3945564641 has 2 divisors, whose sum is σ = 3945564642. Its totient is φ = 3945564640.

The previous prime is 3945564611. The next prime is 3945564653. The reversal of 3945564641 is 1464655493.

3945564641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3839041600 + 106523041 = 61960^2 + 10321^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945564641 - 2⁶ = 3945564577 is a prime.

It is not a weakly prime, because it can be changed into another prime (3945564611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972782320 + 1972782321.

It is an arithmetic number, because the mean of its divisors is an integer number (1972782321).

Almost surely, 2^3945564641 is an apocalyptic number.

It is an amenable number.

3945564641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945564641 is an equidigital number, since it uses as much as digits as its factorization.

3945564641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 47.

The square root of 3945564641 is about 62813.7297173158. The cubic root of 3945564641 is about 1580.1672419508.

The spelling of 3945564641 in words is "three billion, nine hundred forty-five million, five hundred sixty-four thousand, six hundred forty-one".