638160653 has 4 divisors (see below), whose sum is σ = 687249948. Its totient is φ = 589071360.

The previous prime is 638160643. The next prime is 638160667. The reversal of 638160653 is 356061836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185449924 + 452710729 = 13618^2 + 21277^2 .

It is a cyclic number.

It is not a de Polignac number, because 638160653 - 2¹⁸ = 637898509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638160643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24544628 + ... + 24544653.

It is an arithmetic number, because the mean of its divisors is an integer number (171812487).

Almost surely, 2^638160653 is an apocalyptic number.

It is an amenable number.

638160653 is a deficient number, since it is larger than the sum of its proper divisors (49089295).

638160653 is a wasteful number, since it uses less digits than its factorization.

638160653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49089294.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 638160653 is about 25261.8418370474. The cubic root of 638160653 is about 860.9475103154.

The spelling of 638160653 in words is "six hundred thirty-eight million, one hundred sixty thousand, six hundred fifty-three".