10643944836845 has 18 divisors (see below), whose sum is σ = 13018748767038. Its totient is φ = 8354189071488.

The previous prime is 10643944836821. The next prime is 10643944836869. The reversal of 10643944836845 is 54863844934601.

It is an interprime number because it is at equal distance from previous prime (10643944836821) and next prime (10643944836869).

It can be written as a sum of positive squares in 9 ways, for example, as 1520047341604 + 9123897495241 = 1232902^2 + 3020579^2 .

It is not a de Polignac number, because 10643944836845 - 2⁸ = 10643944836589 is a prime.

It is a super-3 number, since 3×10643944836845³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 386631041 + ... + 386658569.

It is an arithmetic number, because the mean of its divisors is an integer number (723263820391).

Almost surely, 2^{10643944836845} is an apocalyptic number.

It is an amenable number.

10643944836845 is a deficient number, since it is larger than the sum of its proper divisors (2374803930193).

10643944836845 is an frugal number, since it uses more digits than its factorization.

10643944836845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55169 (or 27587 counting only the distinct ones).

The product of its (nonzero) digits is 238878720, while the sum is 65.

The spelling of 10643944836845 in words is "ten trillion, six hundred forty-three billion, nine hundred forty-four million, eight hundred thirty-six thousand, eight hundred forty-five".