6547391616 has 64 divisors (see below), whose sum is σ = 17464521600. Its totient is φ = 2173301760.

The previous prime is 6547391581. The next prime is 6547391633. The reversal of 6547391616 is 6161937456.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56106 + ... + 127446.

It is an arithmetic number, because the mean of its divisors is an integer number (272883150).

Almost surely, 2^6547391616 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 6547391616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8732260800).

6547391616 is an abundant number, since it is smaller than the sum of its proper divisors (10917129984).

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

6547391616 is a wasteful number, since it uses less digits than its factorization.

6547391616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71597 (or 71585 counting only the distinct ones).

The product of its digits is 816480, while the sum is 48.

The square root of 6547391616 is about 80915.9540263847. The cubic root of 6547391616 is about 1870.7802339551.

The spelling of 6547391616 in words is "six billion, five hundred forty-seven million, three hundred ninety-one thousand, six hundred sixteen".