6381646408404 has 36 divisors (see below), whose sum is σ = 16279378335220. Its totient is φ = 2107699729920.

The previous prime is 6381646408369. The next prime is 6381646408439. The reversal of 6381646408404 is 4048046461836.

It is a happy number.

6381646408404 is a `hidden beast` number, since 6 + 38 + 164 + 6 + 40 + 8 + 404 = 666.

It is an interprime number because it is at equal distance from previous prime (6381646408369) and next prime (6381646408439).

It can be written as a sum of positive squares in 2 ways, for example, as 2646471732804 + 3735174675600 = 1626798^2 + 1932660^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813151837 + ... + 813159684.

Almost surely, 2^{6381646408404} is an apocalyptic number.

It is an amenable number.

6381646408404 is an abundant number, since it is smaller than the sum of its proper divisors (9897731926816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6381646408404 is a wasteful number, since it uses less digits than its factorization.

6381646408404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626311640 (or 1626311635 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 54.

The spelling of 6381646408404 in words is "six trillion, three hundred eighty-one billion, six hundred forty-six million, four hundred eight thousand, four hundred four".