1664060217 has 8 divisors (see below), whose sum is σ = 2218987200. Its totient is φ = 1109253360.

The previous prime is 1664060213. The next prime is 1664060257. The reversal of 1664060217 is 7120604661.

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

It is not a de Polignac number, because 1664060217 - 2² = 1664060213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664060213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9867 + ... + 58527.

It is an arithmetic number, because the mean of its divisors is an integer number (277373400).

Almost surely, 2^1664060217 is an apocalyptic number.

It is an amenable number.

1664060217 is a deficient number, since it is larger than the sum of its proper divisors (554926983).

1664060217 is a wasteful number, since it uses less digits than its factorization.

1664060217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60063.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 1664060217 is about 40792.8941973967. The cubic root of 1664060217 is about 1185.0127214714.

Adding to 1664060217 its reverse (7120604661), we get a palindrome (8784664878).

The spelling of 1664060217 in words is "one billion, six hundred sixty-four million, sixty thousand, two hundred seventeen".