6437731664 has 80 divisors (see below), whose sum is σ = 15611917440. Its totient is φ = 2503595520.

The previous prime is 6437731613. The next prime is 6437731669. The reversal of 6437731664 is 4661377346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6437731669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48434 + ... + 123374.

It is an arithmetic number, because the mean of its divisors is an integer number (195148968).

Almost surely, 2^6437731664 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 6437731664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7805958720).

6437731664 is an abundant number, since it is smaller than the sum of its proper divisors (9174185776).

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

6437731664 is a wasteful number, since it uses less digits than its factorization.

6437731664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75028 (or 75022 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 47.

The square root of 6437731664 is about 80235.4763430741. The cubic root of 6437731664 is about 1860.2770296893.

The spelling of 6437731664 in words is "six billion, four hundred thirty-seven million, seven hundred thirty-one thousand, six hundred sixty-four".