6436983968644 has 24 divisors (see below), whose sum is σ = 11655741426840. Its totient is φ = 3106821290496.

The previous prime is 6436983968603. The next prime is 6436983968647. The reversal of 6436983968644 is 4468693896346.

It can be written as a sum of positive squares in 4 ways, for example, as 417380602500 + 6019603366144 = 646050^2 + 2453488^2 .

It is a super-2 number, since 2×6436983968644² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6436983968647) 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, 5618517 + ... + 6666460.

It is an arithmetic number, because the mean of its divisors is an integer number (485655892785).

Almost surely, 2^{6436983968644} is an apocalyptic number.

It is an amenable number.

6436983968644 is a deficient number, since it is larger than the sum of its proper divisors (5218757458196).

6436983968644 is a wasteful number, since it uses less digits than its factorization.

6436983968644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289527 (or 12289525 counting only the distinct ones).

The product of its digits is 3869835264, while the sum is 76.

The spelling of 6436983968644 in words is "six trillion, four hundred thirty-six billion, nine hundred eighty-three million, nine hundred sixty-eight thousand, six hundred forty-four".