6444848781 has 16 divisors (see below), whose sum is σ = 10911913600. Its totient is φ = 3682770624.

The previous prime is 6444848749. The next prime is 6444848783. The reversal of 6444848781 is 1878484446.

6444848781 is a `hidden beast` number, since 6 + 4 + 4 + 484 + 87 + 81 = 666.

It is not a de Polignac number, because 6444848781 - 2⁵ = 6444848749 is a prime.

It is a super-2 number, since 2×6444848781² = 83072151619914371922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444848783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17049676 + ... + 17050053.

It is an arithmetic number, because the mean of its divisors is an integer number (681994600).

Almost surely, 2^6444848781 is an apocalyptic number.

It is an amenable number.

6444848781 is a deficient number, since it is larger than the sum of its proper divisors (4467064819).

6444848781 is a wasteful number, since it uses less digits than its factorization.

6444848781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34099745 (or 34099739 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 54.

The square root of 6444848781 is about 80279.8155266939. The cubic root of 6444848781 is about 1860.9623090158.

The spelling of 6444848781 in words is "six billion, four hundred forty-four million, eight hundred forty-eight thousand, seven hundred eighty-one".