221647656475516 has 12 divisors (see below), whose sum is σ = 400395766536640. Its totient is φ = 107248866036480.

The previous prime is 221647656475507. The next prime is 221647656475519. The reversal of 221647656475516 is 615574656746122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221647656475519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893740550181 + ... + 893740550428.

Almost surely, 2^{221647656475516} is an apocalyptic number.

It is an amenable number.

221647656475516 is a deficient number, since it is larger than the sum of its proper divisors (178748110061124).

221647656475516 is a wasteful number, since it uses less digits than its factorization.

221647656475516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787481100644 (or 1787481100642 counting only the distinct ones).

The product of its digits is 508032000, while the sum is 67.

The spelling of 221647656475516 in words is "two hundred twenty-one trillion, six hundred forty-seven billion, six hundred fifty-six million, four hundred seventy-five thousand, five hundred sixteen".