664505283 has 32 divisors (see below), whose sum is σ = 967579200. Its totient is φ = 403223040.

The previous prime is 664505249. The next prime is 664505291. The reversal of 664505283 is 382505466.

It is a Cunningham number, because it is equal to 25778²-1.

It is not a de Polignac number, because 664505283 - 2¹³ = 664497091 is a prime.

It is a super-2 number, since 2×664505283² = 883134542269820178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (664585283) 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 31 ways as a sum of consecutive naturals, for example, 1004973 + ... + 1005633.

It is an arithmetic number, because the mean of its divisors is an integer number (30236850).

Almost surely, 2^664505283 is an apocalyptic number.

664505283 is a deficient number, since it is larger than the sum of its proper divisors (303073917).

664505283 is a wasteful number, since it uses less digits than its factorization.

664505283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 664505283 is about 25777.9999806036. Note that the first 4 decimals coincide. The cubic root of 664505283 is about 872.6353713706.

The spelling of 664505283 in words is "six hundred sixty-four million, five hundred five thousand, two hundred eighty-three".