665224722 has 96 divisors (see below), whose sum is σ = 1644364800. Its totient is φ = 193121280.

The previous prime is 665224717. The next prime is 665224727. The reversal of 665224722 is 227422566.

665224722 is a `hidden beast` number, since 66 + 522 + 4 + 72 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (665224717) and next prime (665224727).

It is not an unprimeable number, because it can be changed into a prime (665224727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216654 + ... + 219702.

It is an arithmetic number, because the mean of its divisors is an integer number (17128800).

Almost surely, 2^665224722 is an apocalyptic number.

665224722 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 665224722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (822182400).

665224722 is an abundant number, since it is smaller than the sum of its proper divisors (979140078).

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

665224722 is a wasteful number, since it uses less digits than its factorization.

665224722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128 (or 3125 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 665224722 is about 25791.9507211068. The cubic root of 665224722 is about 872.9501827558.

The spelling of 665224722 in words is "six hundred sixty-five million, two hundred twenty-four thousand, seven hundred twenty-two".