6138661621 has 8 divisors (see below), whose sum is σ = 6183907200. Its totient is φ = 6093538080.

The previous prime is 6138661609. The next prime is 6138661649. The reversal of 6138661621 is 1261668316.

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 6138661621 - 2¹³ = 6138653429 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 (6138668621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71716 + ... + 131986.

It is an arithmetic number, because the mean of its divisors is an integer number (772988400).

Almost surely, 2^6138661621 is an apocalyptic number.

It is an amenable number.

6138661621 is a deficient number, since it is larger than the sum of its proper divisors (45245579).

6138661621 is a wasteful number, since it uses less digits than its factorization.

6138661621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61019.

The product of its digits is 62208, while the sum is 40.

The square root of 6138661621 is about 78349.6114923361. The cubic root of 6138661621 is about 1831.0121727028.

The spelling of 6138661621 in words is "six billion, one hundred thirty-eight million, six hundred sixty-one thousand, six hundred twenty-one".