165121706 has 4 divisors (see below), whose sum is σ = 247682562. Its totient is φ = 82560852.

The previous prime is 165121699. The next prime is 165121709. The reversal of 165121706 is 607121561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161061481 + 4060225 = 12691^2 + 2015^2 .

It is not an unprimeable number, because it can be changed into a prime (165121709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41280425 + ... + 41280428.

Almost surely, 2^165121706 is an apocalyptic number.

165121706 is a deficient number, since it is larger than the sum of its proper divisors (82560856).

165121706 is an equidigital number, since it uses as much as digits as its factorization.

165121706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82560855.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 165121706 is about 12849.9691050212. The cubic root of 165121706 is about 548.6154774264.

The spelling of 165121706 in words is "one hundred sixty-five million, one hundred twenty-one thousand, seven hundred six".