221780664008 has 108 divisors (see below), whose sum is σ = 443809021905. Its totient is φ = 103896624000.

The previous prime is 221780663941. The next prime is 221780664029. The reversal of 221780664008 is 800466087122.

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 158386488484 + 63394175524 = 397978^2 + 251782^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333002.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221780664008.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1692982103 + ... + 1692982233.

Almost surely, 2^221780664008 is an apocalyptic number.

It is an amenable number.

221780664008 is an abundant number, since it is smaller than the sum of its proper divisors (222028357897).

221780664008 is an equidigital number, since it uses as much as digits as its factorization.

221780664008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 221780664008 in words is "two hundred twenty-one billion, seven hundred eighty million, six hundred sixty-four thousand, eight".