3207221561856 has 160 divisors (see below), whose sum is σ = 9222284111040. Its totient is φ = 984607064064.

The previous prime is 3207221561837. The next prime is 3207221561857. The reversal of 3207221561856 is 6581651227023.

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

It is not an unprimeable number, because it can be changed into a prime (3207221561857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8664540 + ... + 9027108.

It is an arithmetic number, because the mean of its divisors is an integer number (57639275694).

Almost surely, 2^{3207221561856} 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 3207221561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4611142055520).

3207221561856 is an abundant number, since it is smaller than the sum of its proper divisors (6015062549184).

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

3207221561856 is a wasteful number, since it uses less digits than its factorization.

3207221561856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363046 (or 363030 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

Adding to 3207221561856 its reverse (6581651227023), we get a palindrome (9788872788879).

The spelling of 3207221561856 in words is "three trillion, two hundred seven billion, two hundred twenty-one million, five hundred sixty-one thousand, eight hundred fifty-six".