6440467343842 has 96 divisors (see below), whose sum is σ = 12194744180976. Its totient is φ = 2533328179200.

The previous prime is 6440467343839. The next prime is 6440467343851. The reversal of 6440467343842 is 2483437640446.

It can be written as a sum of positive squares in 8 ways, for example, as 4509426378681 + 1931040965161 = 2123541^2 + 1389619^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 159884208 + ... + 159924484.

Almost surely, 2^{6440467343842} is an apocalyptic number.

6440467343842 is a deficient number, since it is larger than the sum of its proper divisors (5754276837134).

6440467343842 is a wasteful number, since it uses less digits than its factorization.

6440467343842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42692 (or 42685 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 55.

The spelling of 6440467343842 in words is "six trillion, four hundred forty billion, four hundred sixty-seven million, three hundred forty-three thousand, eight hundred forty-two".