664166386 has 8 divisors (see below), whose sum is σ = 1072884204. Its totient is φ = 306538320.

The previous prime is 664166341. The next prime is 664166389. The reversal of 664166386 is 683661466.

It can be written as a sum of positive squares in 2 ways, for example, as 646735761 + 17430625 = 25431^2 + 4175^2 .

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

It is a super-2 number, since 2×664166386² = 882233976584601992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664166389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12772405 + ... + 12772456.

Almost surely, 2^664166386 is an apocalyptic number.

664166386 is a deficient number, since it is larger than the sum of its proper divisors (408717818).

664166386 is a wasteful number, since it uses less digits than its factorization.

664166386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25544876.

The product of its digits is 746496, while the sum is 46.

The square root of 664166386 is about 25771.4257657585. The cubic root of 664166386 is about 872.4869984352.

The spelling of 664166386 in words is "six hundred sixty-four million, one hundred sixty-six thousand, three hundred eighty-six".