664221354 has 16 divisors (see below), whose sum is σ = 1335188448. Its totient is φ = 220282832.

The previous prime is 664221293. The next prime is 664221359. The reversal of 664221354 is 453122466.

It is not an unprimeable number, because it can be changed into a prime (664221359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279792 + ... + 282155.

It is an arithmetic number, because the mean of its divisors is an integer number (83449278).

Almost surely, 2^664221354 is an apocalyptic number.

664221354 is an abundant number, since it is smaller than the sum of its proper divisors (670967094).

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

664221354 is a wasteful number, since it uses less digits than its factorization.

664221354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562149.

The product of its digits is 34560, while the sum is 33.

The square root of 664221354 is about 25772.4921961381. The cubic root of 664221354 is about 872.5110674754.

It can be divided in two parts, 66422 and 1354, that added together give a palindrome (67776).

The spelling of 664221354 in words is "six hundred sixty-four million, two hundred twenty-one thousand, three hundred fifty-four".