4144445681 has 8 divisors (see below), whose sum is σ = 4256630784. Its totient is φ = 4032789280.

The previous prime is 4144445663. The next prime is 4144445687. The reversal of 4144445681 is 1865444414.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4144445681 is a prime.

It is a super-2 number, since 2×4144445681² = 34352860005519107522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4144445687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116261 + ... + 147666.

It is an arithmetic number, because the mean of its divisors is an integer number (532078848).

Almost surely, 2^4144445681 is an apocalyptic number.

4144445681 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4144445681 is a deficient number, since it is larger than the sum of its proper divisors (112185103).

4144445681 is a wasteful number, since it uses less digits than its factorization.

4144445681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264351.

The product of its digits is 245760, while the sum is 41.

The square root of 4144445681 is about 64377.3693233888. The cubic root of 4144445681 is about 1606.2833239797.

The spelling of 4144445681 in words is "four billion, one hundred forty-four million, four hundred forty-five thousand, six hundred eighty-one".