664569748 has 6 divisors (see below), whose sum is σ = 1162997066. Its totient is φ = 332284872.

The previous prime is 664569743. The next prime is 664569761. The reversal of 664569748 is 847965466.

664569748 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 390931984 + 273637764 = 19772^2 + 16542^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664569743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83071215 + ... + 83071222.

Almost surely, 2^664569748 is an apocalyptic number.

It is an amenable number.

664569748 is a deficient number, since it is larger than the sum of its proper divisors (498427318).

664569748 is a wasteful number, since it uses less digits than its factorization.

664569748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166142441 (or 166142439 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 55.

The square root of 664569748 is about 25779.2503382081. The cubic root of 664569748 is about 872.6635891649.

The spelling of 664569748 in words is "six hundred sixty-four million, five hundred sixty-nine thousand, seven hundred forty-eight".