1643842331797 has 16 divisors (see below), whose sum is σ = 1733959503360. Its totient is φ = 1554087090672.

The previous prime is 1643842331723. The next prime is 1643842331821. The reversal of 1643842331797 is 7971332483461.

It is a cyclic number.

It is not a de Polignac number, because 1643842331797 - 2¹¹ = 1643842329749 is a prime.

It is a super-2 number, since 2×1643842331797² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643842331707) 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 in 15 ways as a sum of consecutive naturals, for example, 31235568 + ... + 31288150.

It is an arithmetic number, because the mean of its divisors is an integer number (108372468960).

Almost surely, 2^{1643842331797} is an apocalyptic number.

It is an amenable number.

1643842331797 is a deficient number, since it is larger than the sum of its proper divisors (90117171563).

1643842331797 is a wasteful number, since it uses less digits than its factorization.

1643842331797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55992.

The product of its digits is 18289152, while the sum is 58.

The spelling of 1643842331797 in words is "one trillion, six hundred forty-three billion, eight hundred forty-two million, three hundred thirty-one thousand, seven hundred ninety-seven".