1664253642 has 16 divisors (see below), whose sum is σ = 3473225280. Its totient is φ = 530631552.

The previous prime is 1664253637. The next prime is 1664253649. The reversal of 1664253642 is 2463524661.

It is a self number, because there is not a number n which added to its sum of digits gives 1664253642.

It is not an unprimeable number, because it can be changed into a prime (1664253649) 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, 6029767 + ... + 6030042.

It is an arithmetic number, because the mean of its divisors is an integer number (217076580).

Almost surely, 2^1664253642 is an apocalyptic number.

1664253642 is an abundant number, since it is smaller than the sum of its proper divisors (1808971638).

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

1664253642 is a wasteful number, since it uses less digits than its factorization.

1664253642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12059837.

The product of its digits is 207360, while the sum is 39.

The square root of 1664253642 is about 40795.2649458243. The cubic root of 1664253642 is about 1185.0586337133.

The spelling of 1664253642 in words is "one billion, six hundred sixty-four million, two hundred fifty-three thousand, six hundred forty-two".