6431651856 has 160 divisors (see below), whose sum is σ = 21265940480. Its totient is φ = 1823036544.

The previous prime is 6431651843. The next prime is 6431651893. The reversal of 6431651856 is 6581561346.

It is a super-2 number, since 2×6431651856² = 82732291193576489472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 375675 + ... + 392421.

It is an arithmetic number, because the mean of its divisors is an integer number (132912128).

Almost surely, 2^6431651856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6431651856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10632970240).

6431651856 is an abundant number, since it is smaller than the sum of its proper divisors (14834288624).

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

6431651856 is a wasteful number, since it uses less digits than its factorization.

6431651856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16898 (or 16886 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 6431651856 is about 80197.5801131181. The cubic root of 6431651856 is about 1859.6912286617.

The spelling of 6431651856 in words is "six billion, four hundred thirty-one million, six hundred fifty-one thousand, eight hundred fifty-six".