660338447 has 4 divisors (see below), whose sum is σ = 660453696. Its totient is φ = 660223200.

The previous prime is 660338417. The next prime is 660338449. The reversal of 660338447 is 744833066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744833066 = 2 ⋅372416533.

It is a cyclic number.

It is not a de Polignac number, because 660338447 - 2²⁸ = 391902991 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 (660338449) 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, 48554 + ... + 60647.

It is an arithmetic number, because the mean of its divisors is an integer number (165113424).

Almost surely, 2^660338447 is an apocalyptic number.

660338447 is a deficient number, since it is larger than the sum of its proper divisors (115249).

660338447 is a wasteful number, since it uses less digits than its factorization.

660338447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115248.

The product of its (nonzero) digits is 290304, while the sum is 41.

The square root of 660338447 is about 25697.0513288976. The cubic root of 660338447 is about 870.8075678515.

The spelling of 660338447 in words is "six hundred sixty million, three hundred thirty-eight thousand, four hundred forty-seven".