1643842749047 has 2 divisors, whose sum is σ = 1643842749048. Its totient is φ = 1643842749046.

The previous prime is 1643842749013. The next prime is 1643842749061. The reversal of 1643842749047 is 7409472483461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643842749047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643842749077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821921374523 + 821921374524.

It is an arithmetic number, because the mean of its divisors is an integer number (821921374524).

Almost surely, 2^{1643842749047} is an apocalyptic number.

1643842749047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643842749047 is an equidigital number, since it uses as much as digits as its factorization.

1643842749047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32514048, while the sum is 59.

The spelling of 1643842749047 in words is "one trillion, six hundred forty-three billion, eight hundred forty-two million, seven hundred forty-nine thousand, forty-seven".