6638216501 has 8 divisors (see below), whose sum is σ = 7620555264. Its totient is φ = 5664383280.

The previous prime is 6638216443. The next prime is 6638216513. The reversal of 6638216501 is 1056128366.

6638216501 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6638216501 - 2¹⁸ = 6637954357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638216531) 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, 2124710 + ... + 2127831.

It is an arithmetic number, because the mean of its divisors is an integer number (952569408).

Almost surely, 2^6638216501 is an apocalyptic number.

It is an amenable number.

6638216501 is a deficient number, since it is larger than the sum of its proper divisors (982338763).

6638216501 is a wasteful number, since it uses less digits than its factorization.

6638216501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252771.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6638216501 is about 81475.2508495678. The cubic root of 6638216501 is about 1879.3909771862.

The spelling of 6638216501 in words is "six billion, six hundred thirty-eight million, two hundred sixteen thousand, five hundred one".