1664556224243 has 8 divisors (see below), whose sum is σ = 1817700872880. Its totient is φ = 1511715134880.

The previous prime is 1664556224209. The next prime is 1664556224269. The reversal of 1664556224243 is 3424226554661.

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 1664556224243 - 2¹⁸ = 1664555962099 is a prime.

It is a super-2 number, since 2×1664556224243² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664556224191 and 1664556224200.

It is not an unprimeable number, because it can be changed into a prime (1664556224203) 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, 75878348 + ... + 75900281.

It is an arithmetic number, because the mean of its divisors is an integer number (227212609110).

Almost surely, 2^{1664556224243} is an apocalyptic number.

1664556224243 is a deficient number, since it is larger than the sum of its proper divisors (153144648637).

1664556224243 is a wasteful number, since it uses less digits than its factorization.

1664556224243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151779637.

The product of its digits is 8294400, while the sum is 50.

The spelling of 1664556224243 in words is "one trillion, six hundred sixty-four billion, five hundred fifty-six million, two hundred twenty-four thousand, two hundred forty-three".