664142523 has 16 divisors (see below), whose sum is σ = 984254976. Its totient is φ = 394915040.

The previous prime is 664142431. The next prime is 664142561. The reversal of 664142523 is 325241466.

664142523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664142523 - 2¹⁷ = 664011451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (664142593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188115 + ... + 191612.

It is an arithmetic number, because the mean of its divisors is an integer number (61515936).

Almost surely, 2^664142523 is an apocalyptic number.

664142523 is a deficient number, since it is larger than the sum of its proper divisors (320112453).

664142523 is a wasteful number, since it uses less digits than its factorization.

664142523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379794.

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

The square root of 664142523 is about 25770.9627876026. The cubic root of 664142523 is about 872.4765490422.

Adding to 664142523 its reverse (325241466), we get a palindrome (989383989).

The spelling of 664142523 in words is "six hundred sixty-four million, one hundred forty-two thousand, five hundred twenty-three".