664166145 has 16 divisors (see below), whose sum is σ = 1072985472. Its totient is φ = 350782080.

The previous prime is 664166141. The next prime is 664166179. The reversal of 664166145 is 541661466.

It is a happy number.

664166145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664166145 - 2² = 664166141 is a prime.

It is a super-2 number, since 2×664166145² = 882233336328322050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664166141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213396 + ... + 216485.

It is an arithmetic number, because the mean of its divisors is an integer number (67061592).

Almost surely, 2^664166145 is an apocalyptic number.

It is an amenable number.

664166145 is a deficient number, since it is larger than the sum of its proper divisors (408819327).

664166145 is a wasteful number, since it uses less digits than its factorization.

664166145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429992.

The product of its digits is 103680, while the sum is 39.

The square root of 664166145 is about 25771.4210900369. The cubic root of 664166145 is about 872.4868929047.

The spelling of 664166145 in words is "six hundred sixty-four million, one hundred sixty-six thousand, one hundred forty-five".