664916285 has 16 divisors (see below), whose sum is σ = 888959232. Its totient is φ = 473284800.

The previous prime is 664916281. The next prime is 664916341. The reversal of 664916285 is 582619466.

It is not a de Polignac number, because 664916285 - 2² = 664916281 is a prime.

It is a super-2 number, since 2×664916285² = 884227332116402450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664916281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126026 + ... + 131195.

It is an arithmetic number, because the mean of its divisors is an integer number (55559952).

Almost surely, 2^664916285 is an apocalyptic number.

It is an amenable number.

664916285 is a deficient number, since it is larger than the sum of its proper divisors (224042947).

664916285 is a wasteful number, since it uses less digits than its factorization.

664916285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257284.

The product of its digits is 622080, while the sum is 47.

The square root of 664916285 is about 25785.9707011390. The cubic root of 664916285 is about 872.8152450168.

The spelling of 664916285 in words is "six hundred sixty-four million, nine hundred sixteen thousand, two hundred eighty-five".