221661545134117 has 8 divisors (see below), whose sum is σ = 241812813471552. Its totient is φ = 201510313260000.

The previous prime is 221661545134103. The next prime is 221661545134129. The reversal of 221661545134117 is 711431545166122.

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 221661545134117 - 2¹⁹ = 221661544609829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221661545134157) 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, 4475992 + ... + 21525742.

It is an arithmetic number, because the mean of its divisors is an integer number (30226601683944).

Almost surely, 2^{221661545134117} is an apocalyptic number.

It is an amenable number.

221661545134117 is a deficient number, since it is larger than the sum of its proper divisors (20151268337435).

221661545134117 is a wasteful number, since it uses less digits than its factorization.

221661545134117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18231659.

The product of its digits is 1209600, while the sum is 49.

The spelling of 221661545134117 in words is "two hundred twenty-one trillion, six hundred sixty-one billion, five hundred forty-five million, one hundred thirty-four thousand, one hundred seventeen".