6435739641668 has 12 divisors (see below), whose sum is σ = 11344752726972. Its totient is φ = 3194381719680.

The previous prime is 6435739641613. The next prime is 6435739641677. The reversal of 6435739641668 is 8661469375346.

It can be written as a sum of positive squares in 2 ways, for example, as 1230187103044 + 5205552538624 = 1109138^2 + 2281568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6435739641598 and 6435739641607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5872024673 + ... + 5872025768.

It is an arithmetic number, because the mean of its divisors is an integer number (945396060581).

Almost surely, 2^{6435739641668} is an apocalyptic number.

It is an amenable number.

6435739641668 is a deficient number, since it is larger than the sum of its proper divisors (4909013085304).

6435739641668 is a wasteful number, since it uses less digits than its factorization.

6435739641668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11744050582 (or 11744050580 counting only the distinct ones).

The product of its digits is 470292480, while the sum is 68.

The spelling of 6435739641668 in words is "six trillion, four hundred thirty-five billion, seven hundred thirty-nine million, six hundred forty-one thousand, six hundred sixty-eight".