4445911643 has 4 divisors (see below), whose sum is σ = 4446395448. Its totient is φ = 4445427840.

The previous prime is 4445911633. The next prime is 4445911649. The reversal of 4445911643 is 3461195444.

4445911643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4445911643 - 2¹² = 4445907547 is a prime.

It is a super-2 number, since 2×4445911643² = 39532260674725918898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4445911643.

It is not an unprimeable number, because it can be changed into a prime (4445911649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227846 + ... + 246587.

It is an arithmetic number, because the mean of its divisors is an integer number (1111598862).

Almost surely, 2^4445911643 is an apocalyptic number.

4445911643 is a deficient number, since it is larger than the sum of its proper divisors (483805).

4445911643 is an equidigital number, since it uses as much as digits as its factorization.

4445911643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483804.

The product of its digits is 207360, while the sum is 41.

The square root of 4445911643 is about 66677.6697478249. The cubic root of 4445911643 is about 1644.3222841217.

The spelling of 4445911643 in words is "four billion, four hundred forty-five million, nine hundred eleven thousand, six hundred forty-three".