6663647420 has 48 divisors (see below), whose sum is σ = 14952833280. Its totient is φ = 2485638144.

The previous prime is 6663647387. The next prime is 6663647429. The reversal of 6663647420 is 247463666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663647429) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52844 + ... + 126963.

It is an arithmetic number, because the mean of its divisors is an integer number (311517360).

Almost surely, 2^6663647420 is an apocalyptic number.

It is an amenable number.

6663647420 is an abundant number, since it is smaller than the sum of its proper divisors (8289185860).

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

6663647420 is a wasteful number, since it uses less digits than its factorization.

6663647420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179942 (or 179940 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 44.

The square root of 6663647420 is about 81631.1669645853. The cubic root of 6663647420 is about 1881.7878928702.

The spelling of 6663647420 in words is "six billion, six hundred sixty-three million, six hundred forty-seven thousand, four hundred twenty".