165677906 has 4 divisors (see below), whose sum is σ = 248516862. Its totient is φ = 82838952.

The previous prime is 165677893. The next prime is 165677909. The reversal of 165677906 is 609776561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609776561 = 389 ⋅1567549.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 21077281 = 12025^2 + 4591^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165677909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41419475 + ... + 41419478.

Almost surely, 2^165677906 is an apocalyptic number.

165677906 is a deficient number, since it is larger than the sum of its proper divisors (82838956).

165677906 is an equidigital number, since it uses as much as digits as its factorization.

165677906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82838955.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 165677906 is about 12871.5929861070. The cubic root of 165677906 is about 549.2307770177.

The spelling of 165677906 in words is "one hundred sixty-five million, six hundred seventy-seven thousand, nine hundred six".