164916665 has 4 divisors (see below), whose sum is σ = 197900004. Its totient is φ = 131933328.

The previous prime is 164916641. The next prime is 164916667. The reversal of 164916665 is 566619461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129299641 + 35617024 = 11371^2 + 5968^2 .

It is a cyclic number.

It is not a de Polignac number, because 164916665 - 2¹² = 164912569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164916667) 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, 16491662 + ... + 16491671.

It is an arithmetic number, because the mean of its divisors is an integer number (49475001).

Almost surely, 2^164916665 is an apocalyptic number.

It is an amenable number.

164916665 is a deficient number, since it is larger than the sum of its proper divisors (32983339).

164916665 is an equidigital number, since it uses as much as digits as its factorization.

164916665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32983338.

The product of its digits is 233280, while the sum is 44.

The square root of 164916665 is about 12841.9883585059. The cubic root of 164916665 is about 548.3883010360.

The spelling of 164916665 in words is "one hundred sixty-four million, nine hundred sixteen thousand, six hundred sixty-five".