664642122 has 16 divisors (see below), whose sum is σ = 1338849120. Its totient is φ = 219953232.

The previous prime is 664642093. The next prime is 664642123. The reversal of 664642122 is 221246466.

664642122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664642123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397633 + ... + 399300.

It is an arithmetic number, because the mean of its divisors is an integer number (83678070).

Almost surely, 2^664642122 is an apocalyptic number.

664642122 is an abundant number, since it is smaller than the sum of its proper divisors (674206998).

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

664642122 is a wasteful number, since it uses less digits than its factorization.

664642122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797077.

The product of its digits is 27648, while the sum is 33.

The square root of 664642122 is about 25780.6540258388. The cubic root of 664642122 is about 872.6952667338.

Adding to 664642122 its reverse (221246466), we get a palindrome (885888588).

It can be divided in two parts, 66464 and 2122, that added together give a palindrome (68586).

The spelling of 664642122 in words is "six hundred sixty-four million, six hundred forty-two thousand, one hundred twenty-two".