664166135 has 4 divisors (see below), whose sum is σ = 796999368. Its totient is φ = 531332904.

The previous prime is 664166131. The next prime is 664166137. The reversal of 664166135 is 531661466.

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 664166135 - 2² = 664166131 is a prime.

It is a super-2 number, since 2×664166135² = 882233309761676450, 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 (664166131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66416609 + ... + 66416618.

It is an arithmetic number, because the mean of its divisors is an integer number (199249842).

Almost surely, 2^664166135 is an apocalyptic number.

664166135 is a deficient number, since it is larger than the sum of its proper divisors (132833233).

664166135 is a wasteful number, since it uses less digits than its factorization.

664166135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132833232.

The product of its digits is 77760, while the sum is 38.

The square root of 664166135 is about 25771.4208960236. The cubic root of 664166135 is about 872.4868885258.

The spelling of 664166135 in words is "six hundred sixty-four million, one hundred sixty-six thousand, one hundred thirty-five".