612255221888 has 216 divisors, whose sum is σ = 1331245197765. Its totient is φ = 280450621440.

The previous prime is 612255221827. The next prime is 612255221891. The reversal of 612255221888 is 888122552216.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 610660976704 + 1594245184 = 781448^2 + 39928^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=553288.

It is a super-2 number, since 2×612255221888² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6311909456 + ... + 6311909552.

Almost surely, 2^612255221888 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 612255221888

612255221888 is an abundant number, since it is smaller than the sum of its proper divisors (718989975877).

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

612255221888 is an frugal number, since it uses more digits than its factorization.

612255221888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 153 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 50.

Multiplying 612255221888 by its sum of digits (50), we get a square (30612761094400 = 5532880²).

The spelling of 612255221888 in words is "six hundred twelve billion, two hundred fifty-five million, two hundred twenty-one thousand, eight hundred eighty-eight".