660422664 has 192 divisors, whose sum is σ = 2085108480. Its totient is φ = 186624000.

The previous prime is 660422639. The next prime is 660422701. The reversal of 660422664 is 466224066.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2436849 + ... + 2437119.

It is an arithmetic number, because the mean of its divisors is an integer number (10859940).

Almost surely, 2^660422664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660422664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042554240).

660422664 is an abundant number, since it is smaller than the sum of its proper divisors (1424685816).

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

660422664 is a wasteful number, since it uses less digits than its factorization.

660422664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 660422664 is about 25698.6899276986. The cubic root of 660422664 is about 870.8445860825.

It can be divided in two parts, 660 and 422664, that added together give a palindrome (423324).

The spelling of 660422664 in words is "six hundred sixty million, four hundred twenty-two thousand, six hundred sixty-four".