221165605623 has 8 divisors (see below), whose sum is σ = 294893117568. Its totient is φ = 147440915384.

The previous prime is 221165605541. The next prime is 221165605651. The reversal of 221165605623 is 326506561122.

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

It is a cyclic number.

It is not a de Polignac number, because 221165605623 - 2²¹ = 221163508471 is a prime.

It is a super-2 number, since 2×221165605623² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221165605693) 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, 515211 + ... + 841292.

It is an arithmetic number, because the mean of its divisors is an integer number (36861639696).

Almost surely, 2^221165605623 is an apocalyptic number.

221165605623 is a deficient number, since it is larger than the sum of its proper divisors (73727511945).

221165605623 is a wasteful number, since it uses less digits than its factorization.

221165605623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410853.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 221165605623 in words is "two hundred twenty-one billion, one hundred sixty-five million, six hundred five thousand, six hundred twenty-three".