221966716751 has 8 divisors (see below), whose sum is σ = 239180000304. Its totient is φ = 204773279040.

The previous prime is 221966716709. The next prime is 221966716787. The reversal of 221966716751 is 157617669122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221966716751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221966716693 and 221966716702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221966716051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4938221 + ... + 4982966.

It is an arithmetic number, because the mean of its divisors is an integer number (29897500038).

Almost surely, 2^221966716751 is an apocalyptic number.

221966716751 is a deficient number, since it is larger than the sum of its proper divisors (17213283553).

221966716751 is a wasteful number, since it uses less digits than its factorization.

221966716751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9922921.

The product of its digits is 1905120, while the sum is 53.

The spelling of 221966716751 in words is "two hundred twenty-one billion, nine hundred sixty-six million, seven hundred sixteen thousand, seven hundred fifty-one".