664260433 has 4 divisors (see below), whose sum is σ = 664356708. Its totient is φ = 664164160.

The previous prime is 664260391. The next prime is 664260437. The reversal of 664260433 is 334062466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 334062466 = 2 ⋅167031233.

It can be written as a sum of positive squares in 2 ways, for example, as 279825984 + 384434449 = 16728^2 + 19607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664260433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664260437) 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, 36916 + ... + 51877.

It is an arithmetic number, because the mean of its divisors is an integer number (166089177).

Almost surely, 2^664260433 is an apocalyptic number.

It is an amenable number.

664260433 is a deficient number, since it is larger than the sum of its proper divisors (96275).

664260433 is an equidigital number, since it uses as much as digits as its factorization.

664260433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96274.

The product of its (nonzero) digits is 62208, while the sum is 34.

The square root of 664260433 is about 25773.2503382868. The cubic root of 664260433 is about 872.5281783331.

The spelling of 664260433 in words is "six hundred sixty-four million, two hundred sixty thousand, four hundred thirty-three".