6400646463 has 8 divisors (see below), whose sum is σ = 8828478000. Its totient is φ = 4119956288.

The previous prime is 6400646453. The next prime is 6400646501. The reversal of 6400646463 is 3646460046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6400646463 - 2¹⁰ = 6400645439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400646453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36785238 + ... + 36785411.

It is an arithmetic number, because the mean of its divisors is an integer number (1103559750).

Almost surely, 2^6400646463 is an apocalyptic number.

6400646463 is a deficient number, since it is larger than the sum of its proper divisors (2427831537).

6400646463 is a wasteful number, since it uses less digits than its factorization.

6400646463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73570681.

The product of its (nonzero) digits is 248832, while the sum is 39.

The square root of 6400646463 is about 80004.0402917253. The cubic root of 6400646463 is about 1856.6980441621.

The spelling of 6400646463 in words is "six billion, four hundred million, six hundred forty-six thousand, four hundred sixty-three".