1447945865647 has 4 divisors (see below), whose sum is σ = 1447948275280. Its totient is φ = 1447943456016.

The previous prime is 1447945865629. The next prime is 1447945865677. The reversal of 1447945865647 is 7465685497441.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1447945865647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1447945865627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511963 + ... + 1777075.

It is an arithmetic number, because the mean of its divisors is an integer number (361987068820).

Almost surely, 2^{1447945865647} is an apocalyptic number.

1447945865647 is a deficient number, since it is larger than the sum of its proper divisors (2409633).

1447945865647 is a wasteful number, since it uses less digits than its factorization.

1447945865647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2409632.

The product of its digits is 812851200, while the sum is 70.

The spelling of 1447945865647 in words is "one trillion, four hundred forty-seven billion, nine hundred forty-five million, eight hundred sixty-five thousand, six hundred forty-seven".