1642144633 has 8 divisors (see below), whose sum is σ = 1730824200. Its totient is φ = 1555602048.

The previous prime is 1642144627. The next prime is 1642144649. The reversal of 1642144633 is 3364412461.

It can be written as a sum of positive squares in 4 ways, for example, as 188018944 + 1454125689 = 13712^2 + 38133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642144633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642144333) 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, 532668 + ... + 535741.

It is an arithmetic number, because the mean of its divisors is an integer number (216353025).

Almost surely, 2^1642144633 is an apocalyptic number.

It is an amenable number.

1642144633 is a deficient number, since it is larger than the sum of its proper divisors (88679567).

1642144633 is a wasteful number, since it uses less digits than its factorization.

1642144633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068491.

The product of its digits is 41472, while the sum is 34.

The square root of 1642144633 is about 40523.3837802324. The cubic root of 1642144633 is about 1179.7875306910.

The spelling of 1642144633 in words is "one billion, six hundred forty-two million, one hundred forty-four thousand, six hundred thirty-three".