221646263260616 has 8 divisors (see below), whose sum is σ = 415586743613670. Its totient is φ = 110823131630304.

The previous prime is 221646263260573. The next prime is 221646263260661. The reversal of 221646263260616 is 616062362646122.

It can be written as a sum of positive squares in only one way, i.e., 203143619099716 + 18502644160900 = 14252846^2 + 4301470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13852891453781 + ... + 13852891453796.

Almost surely, 2^{221646263260616} is an apocalyptic number.

It is an amenable number.

221646263260616 is a deficient number, since it is larger than the sum of its proper divisors (193940480353054).

221646263260616 is a wasteful number, since it uses less digits than its factorization.

221646263260616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27705782907583 (or 27705782907579 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 53.

The spelling of 221646263260616 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred sixty-three million, two hundred sixty thousand, six hundred sixteen".