6544457856 has 160 divisors (see below), whose sum is σ = 19545284880. Its totient is φ = 2173754880.

The previous prime is 6544457849. The next prime is 6544457923. The reversal of 6544457856 is 6587544456.

6544457856 is a `hidden beast` number, since 6 + 544 + 45 + 7 + 8 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3430855 + ... + 3432761.

Almost surely, 2^6544457856 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 6544457856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9772642440).

6544457856 is an abundant number, since it is smaller than the sum of its proper divisors (13000827024).

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

6544457856 is a wasteful number, since it uses less digits than its factorization.

6544457856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 2243 counting only the distinct ones).

The product of its digits is 16128000, while the sum is 54.

The square root of 6544457856 is about 80897.8235553961. The cubic root of 6544457856 is about 1870.5007720209.

The spelling of 6544457856 in words is "six billion, five hundred forty-four million, four hundred fifty-seven thousand, eight hundred fifty-six".