665227264 has 117 divisors (see below), whose sum is σ = 1488460329. Its totient is φ = 297123840.

The previous prime is 665227253. The next prime is 665227267. The reversal of 665227264 is 462722566.

The square root of 665227264 is 25792.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 98406400 + 566820864 = 9920^2 + 23808^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

Its product of digits (241920) is a multiple of the sum of its prime factors (112).

It is not an unprimeable number, because it can be changed into a prime (665227267) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21458929 + ... + 21458959.

Almost surely, 2^665227264 is an apocalyptic number.

665227264 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

665227264 is the 25792-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665227264

665227264 is an abundant number, since it is smaller than the sum of its proper divisors (823233065).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665227264 is an equidigital number, since it uses as much as digits as its factorization.

665227264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 46 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The cubic root of 665227264 is about 872.9512946790.

The spelling of 665227264 in words is "six hundred sixty-five million, two hundred twenty-seven thousand, two hundred sixty-four".