164317661 has 4 divisors (see below), whose sum is σ = 164562492. Its totient is φ = 164072832.

The previous prime is 164317633. The next prime is 164317667. The reversal of 164317661 is 166713461.

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 126112900 + 38204761 = 11230^2 + 6181^2 .

It is a cyclic number.

It is not a de Polignac number, because 164317661 - 2¹⁰ = 164316637 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 (164317667) 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, 121406 + ... + 122751.

It is an arithmetic number, because the mean of its divisors is an integer number (41140623).

Almost surely, 2^164317661 is an apocalyptic number.

It is an amenable number.

164317661 is a deficient number, since it is larger than the sum of its proper divisors (244831).

164317661 is an equidigital number, since it uses as much as digits as its factorization.

164317661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244830.

The product of its digits is 18144, while the sum is 35.

The square root of 164317661 is about 12818.6450532028. The cubic root of 164317661 is about 547.7235505572.

The spelling of 164317661 in words is "one hundred sixty-four million, three hundred seventeen thousand, six hundred sixty-one".