665663622 has 48 divisors (see below), whose sum is σ = 1491391440. Its totient is φ = 197748096.

The previous prime is 665663617. The next prime is 665663681. The reversal of 665663622 is 226366566.

665663622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18088 + ... + 40724.

It is an arithmetic number, because the mean of its divisors is an integer number (31070655).

Almost surely, 2^665663622 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665663622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745695720).

665663622 is an abundant number, since it is smaller than the sum of its proper divisors (825727818).

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

665663622 is a wasteful number, since it uses less digits than its factorization.

665663622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22697 (or 22684 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The square root of 665663622 is about 25800.4577866363. The cubic root of 665663622 is about 873.1421247124.

The spelling of 665663622 in words is "six hundred sixty-five million, six hundred sixty-three thousand, six hundred twenty-two".