664356114161 has 4 divisors (see below), whose sum is σ = 682311684852. Its totient is φ = 646400543472.

The previous prime is 664356114133. The next prime is 664356114173. The reversal of 664356114161 is 161411653466.

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 361904512225 + 302451601936 = 601585^2 + 549956^2 .

It is a cyclic number.

It is not a de Polignac number, because 664356114161 - 2¹⁴ = 664356097777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664356114131) 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, 8977785290 + ... + 8977785363.

It is an arithmetic number, because the mean of its divisors is an integer number (170577921213).

Almost surely, 2^664356114161 is an apocalyptic number.

It is an amenable number.

664356114161 is a deficient number, since it is larger than the sum of its proper divisors (17955570691).

664356114161 is a wasteful number, since it uses less digits than its factorization.

664356114161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955570690.

The product of its digits is 311040, while the sum is 44.

The spelling of 664356114161 in words is "six hundred sixty-four billion, three hundred fifty-six million, one hundred fourteen thousand, one hundred sixty-one".