667637165 has 8 divisors (see below), whose sum is σ = 862792728. Its totient is φ = 493024320.

The previous prime is 667637161. The next prime is 667637167. The reversal of 667637165 is 561736766.

It can be written as a sum of positive squares in 4 ways, for example, as 21104836 + 646532329 = 4594^2 + 25427^2 .

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

It is not a de Polignac number, because 667637165 - 2² = 667637161 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 (667637161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5135606 + ... + 5135735.

It is an arithmetic number, because the mean of its divisors is an integer number (107849091).

Almost surely, 2^667637165 is an apocalyptic number.

667637165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

667637165 is a deficient number, since it is larger than the sum of its proper divisors (195155563).

667637165 is a wasteful number, since it uses less digits than its factorization.

667637165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271359.

The product of its digits is 952560, while the sum is 47.

The square root of 667637165 is about 25838.6757594115. The cubic root of 667637165 is about 874.0041633959.

The spelling of 667637165 in words is "six hundred sixty-seven million, six hundred thirty-seven thousand, one hundred sixty-five".