664200245 has 4 divisors (see below), whose sum is σ = 797040300. Its totient is φ = 531360192.

The previous prime is 664200239. The next prime is 664200263. The reversal of 664200245 is 542002466.

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 395174641 + 269025604 = 19879^2 + 16402^2 .

It is a cyclic number.

It is not a de Polignac number, because 664200245 - 2⁸ = 664199989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66420020 + ... + 66420029.

It is an arithmetic number, because the mean of its divisors is an integer number (199260075).

Almost surely, 2^664200245 is an apocalyptic number.

It is an amenable number.

664200245 is a deficient number, since it is larger than the sum of its proper divisors (132840055).

664200245 is a wasteful number, since it uses less digits than its factorization.

664200245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132840054.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 664200245 is about 25772.0826671032. The cubic root of 664200245 is about 872.5018245570.

The spelling of 664200245 in words is "six hundred sixty-four million, two hundred thousand, two hundred forty-five".