165355394 has 4 divisors (see below), whose sum is σ = 248033094. Its totient is φ = 82677696.

The previous prime is 165355391. The next prime is 165355451. The reversal of 165355394 is 493553561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493553561 = 11423 ⋅43207.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 27175369 = 11755^2 + 5213^2 .

It is not an unprimeable number, because it can be changed into a prime (165355391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41338847 + ... + 41338850.

Almost surely, 2^165355394 is an apocalyptic number.

165355394 is a deficient number, since it is larger than the sum of its proper divisors (82677700).

165355394 is an equidigital number, since it uses as much as digits as its factorization.

165355394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82677699.

The product of its digits is 243000, while the sum is 41.

The square root of 165355394 is about 12859.0588302566. The cubic root of 165355394 is about 548.8741642334.

The spelling of 165355394 in words is "one hundred sixty-five million, three hundred fifty-five thousand, three hundred ninety-four".