6642745344 has 180 divisors, whose sum is σ = 20208064240. Its totient is φ = 2096824320.

The previous prime is 6642745337. The next prime is 6642745387. The reversal of 6642745344 is 4435472466.

6642745344 is a `hidden beast` number, since 6 + 6 + 42 + 74 + 534 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6642745344.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2800479 + ... + 2802849.

Almost surely, 2^6642745344 is an apocalyptic number.

6642745344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6642745344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10104032120).

6642745344 is an abundant number, since it is smaller than the sum of its proper divisors (13565318896).

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

6642745344 is a wasteful number, since it uses less digits than its factorization.

6642745344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424 (or 2395 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 45.

The square root of 6642745344 is about 81503.0388635908. The cubic root of 6642745344 is about 1879.8182772894.

The spelling of 6642745344 in words is "six billion, six hundred forty-two million, seven hundred forty-five thousand, three hundred forty-four".