1664600605 has 8 divisors (see below), whose sum is σ = 2016189792. Its totient is φ = 1319234448.

The previous prime is 1664600603. The next prime is 1664600629. The reversal of 1664600605 is 5060064661.

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 1664600605 - 2¹ = 1664600603 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 (1664600603) 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, 1555167 + ... + 1556236.

It is an arithmetic number, because the mean of its divisors is an integer number (252023724).

Almost surely, 2^1664600605 is an apocalyptic number.

It is an amenable number.

1664600605 is a deficient number, since it is larger than the sum of its proper divisors (351589187).

1664600605 is a wasteful number, since it uses less digits than its factorization.

1664600605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111515.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1664600605 is about 40799.5172152809. The cubic root of 1664600605 is about 1185.1409815233.

The spelling of 1664600605 in words is "one billion, six hundred sixty-four million, six hundred thousand, six hundred five".