3945643617472 has 14 divisors (see below), whose sum is σ = 7829636553548. Its totient is φ = 1972821808704.

The previous prime is 3945643617463. The next prime is 3945643617497. The reversal of 3945643617472 is 2747163465493.

It is a self number, because there is not a number n which added to its sum of digits gives 3945643617472.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825340698 + ... + 30825340825.

Almost surely, 2^{3945643617472} is an apocalyptic number.

3945643617472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3945643617472 is a deficient number, since it is larger than the sum of its proper divisors (3883992936076).

3945643617472 is an equidigital number, since it uses as much as digits as its factorization.

3945643617472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61650681535 (or 61650681525 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 61.

The spelling of 3945643617472 in words is "three trillion, nine hundred forty-five billion, six hundred forty-three million, six hundred seventeen thousand, four hundred seventy-two".