10643505444 has 144 divisors (see below), whose sum is σ = 31661570304. Its totient is φ = 2972160000.

The previous prime is 10643505419. The next prime is 10643505487. The reversal of 10643505444 is 44450534601.

10643505444 is a `hidden beast` number, since 1 + 0 + 64 + 3 + 50 + 544 + 4 = 666.

It is a super-2 number, since 2×10643505444² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 10643505399 and 10643505408.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3864772 + ... + 3867524.

It is an arithmetic number, because the mean of its divisors is an integer number (219872016).

Almost surely, 2^10643505444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10643505444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15830785152).

10643505444 is an abundant number, since it is smaller than the sum of its proper divisors (21018064860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10643505444 is a wasteful number, since it uses less digits than its factorization.

10643505444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538 (or 3533 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 10643505444 in words is "ten billion, six hundred forty-three million, five hundred five thousand, four hundred forty-four".