664160999 has 4 divisors (see below), whose sum is σ = 665595936. Its totient is φ = 662726064.

The previous prime is 664160977. The next prime is 664161031. The reversal of 664160999 is 999061466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664160999 - 2¹² = 664156903 is a prime.

It is a super-2 number, since 2×664160999² = 882219665185356002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664160899) 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 3 ways as a sum of consecutive naturals, for example, 716774 + ... + 717699.

It is an arithmetic number, because the mean of its divisors is an integer number (166398984).

Almost surely, 2^664160999 is an apocalyptic number.

664160999 is a deficient number, since it is larger than the sum of its proper divisors (1434937).

664160999 is a wasteful number, since it uses less digits than its factorization.

664160999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434936.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 664160999 is about 25771.3212505684. The cubic root of 664160999 is about 872.4846395382.

The spelling of 664160999 in words is "six hundred sixty-four million, one hundred sixty thousand, nine hundred ninety-nine".