1643412808653 has 64 divisors (see below), whose sum is σ = 2853377114112. Its totient is φ = 815831628480.

The previous prime is 1643412808619. The next prime is 1643412808657. The reversal of 1643412808653 is 3568082143461.

It is not a de Polignac number, because 1643412808653 - 2⁶ = 1643412808589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1643412808596 and 1643412808605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643412808657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5502226 + ... + 5793212.

It is an arithmetic number, because the mean of its divisors is an integer number (44584017408).

Almost surely, 2^{1643412808653} is an apocalyptic number.

It is an amenable number.

1643412808653 is a deficient number, since it is larger than the sum of its proper divisors (1209964305459).

1643412808653 is a wasteful number, since it uses less digits than its factorization.

1643412808653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292094.

The product of its (nonzero) digits is 3317760, while the sum is 51.

The spelling of 1643412808653 in words is "one trillion, six hundred forty-three billion, four hundred twelve million, eight hundred eight thousand, six hundred fifty-three".