38643556121 has 4 divisors (see below), whose sum is σ = 38656707600. Its totient is φ = 38630404644.

The previous prime is 38643556111. The next prime is 38643556129. The reversal of 38643556121 is 12165534683.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38643556121 - 2⁶ = 38643556057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38643556129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6571331 + ... + 6577208.

It is an arithmetic number, because the mean of its divisors is an integer number (9664176900).

Almost surely, 2^38643556121 is an apocalyptic number.

It is an amenable number.

38643556121 is a deficient number, since it is larger than the sum of its proper divisors (13151479).

38643556121 is a wasteful number, since it uses less digits than its factorization.

38643556121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13151478.

The product of its digits is 518400, while the sum is 44.

The spelling of 38643556121 in words is "thirty-eight billion, six hundred forty-three million, five hundred fifty-six thousand, one hundred twenty-one".