664200247 has 4 divisors (see below), whose sum is σ = 664599880. Its totient is φ = 663800616.

The previous prime is 664200239. The next prime is 664200263. The reversal of 664200247 is 742002466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664200247 - 2³ = 664200239 is a prime.

It is a super-2 number, since 2×664200247² = 882323936229722018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664000247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197313 + ... + 200650.

It is an arithmetic number, because the mean of its divisors is an integer number (166149970).

Almost surely, 2^664200247 is an apocalyptic number.

664200247 is a deficient number, since it is larger than the sum of its proper divisors (399633).

664200247 is a wasteful number, since it uses less digits than its factorization.

664200247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399632.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 664200247 is about 25772.0827059049. The cubic root of 664200247 is about 872.5018254328.

The spelling of 664200247 in words is "six hundred sixty-four million, two hundred thousand, two hundred forty-seven".