3945808657573 has 2 divisors, whose sum is σ = 3945808657574. Its totient is φ = 3945808657572.

The previous prime is 3945808657559. The next prime is 3945808657579. The reversal of 3945808657573 is 3757568085493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3666313516644 + 279495140929 = 1914762^2 + 528673^2 .

It is an emirp because it is prime and its reverse (3757568085493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3945808657573 - 2⁵ = 3945808657541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945808657579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972904328786 + 1972904328787.

It is an arithmetic number, because the mean of its divisors is an integer number (1972904328787).

Almost surely, 2^{3945808657573} is an apocalyptic number.

It is an amenable number.

3945808657573 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945808657573 is an equidigital number, since it uses as much as digits as its factorization.

3945808657573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048000, while the sum is 70.

The spelling of 3945808657573 in words is "three trillion, nine hundred forty-five billion, eight hundred eight million, six hundred fifty-seven thousand, five hundred seventy-three".