6446663531220 has 96 divisors (see below), whose sum is σ = 20025383293440. Its totient is φ = 1536338911360.

The previous prime is 6446663531197. The next prime is 6446663531221. The reversal of 6446663531220 is 221353666446.

It is a self number, because there is not a number n which added to its sum of digits gives 6446663531220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446663531221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82737942 + ... + 82815821.

It is an arithmetic number, because the mean of its divisors is an integer number (208597742640).

Almost surely, 2^{6446663531220} is an apocalyptic number.

6446663531220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6446663531220 is an abundant number, since it is smaller than the sum of its proper divisors (13578719762220).

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

6446663531220 is a wasteful number, since it uses less digits than its factorization.

6446663531220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165553845 (or 165553843 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 48.

The spelling of 6446663531220 in words is "six trillion, four hundred forty-six billion, six hundred sixty-three million, five hundred thirty-one thousand, two hundred twenty".