664123241 has 4 divisors (see below), whose sum is σ = 703189332. Its totient is φ = 625057152.

The previous prime is 664123237. The next prime is 664123253. The reversal of 664123241 is 142321466.

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 180123241 + 484000000 = 13421^2 + 22000^2 .

It is a cyclic number.

It is not a de Polignac number, because 664123241 - 2² = 664123237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664129241) 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, 19533020 + ... + 19533053.

It is an arithmetic number, because the mean of its divisors is an integer number (175797333).

Almost surely, 2^664123241 is an apocalyptic number.

It is an amenable number.

664123241 is a deficient number, since it is larger than the sum of its proper divisors (39066091).

664123241 is a wasteful number, since it uses less digits than its factorization.

664123241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39066090.

The product of its digits is 6912, while the sum is 29.

The square root of 664123241 is about 25770.5886816735. The cubic root of 664123241 is about 872.4681054452.

The spelling of 664123241 in words is "six hundred sixty-four million, one hundred twenty-three thousand, two hundred forty-one".