1643665673147 has 2 divisors, whose sum is σ = 1643665673148. Its totient is φ = 1643665673146.

The previous prime is 1643665673099. The next prime is 1643665673203. The reversal of 1643665673147 is 7413765663461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1643665673147 - 2¹⁶ = 1643665607611 is a prime.

It is not a weakly prime, because it can be changed into another prime (1643665673647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821832836573 + 821832836574.

It is an arithmetic number, because the mean of its divisors is an integer number (821832836574).

Almost surely, 2^{1643665673147} is an apocalyptic number.

1643665673147 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643665673147 is an equidigital number, since it uses as much as digits as its factorization.

1643665673147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 59.

The spelling of 1643665673147 in words is "one trillion, six hundred forty-three billion, six hundred sixty-five million, six hundred seventy-three thousand, one hundred forty-seven".