38721155855481 has 12 divisors (see below), whose sum is σ = 61015154681520. Its totient is φ = 23467367185080.

The previous prime is 38721155855461. The next prime is 38721155855483. The reversal of 38721155855481 is 18455855112783.

38721155855481 is a `hidden beast` number, since 3 + 8 + 7 + 2 + 1 + 1 + 5 + 5 + 85 + 548 + 1 = 666.

It is not a de Polignac number, because 38721155855481 - 2⁷ = 38721155855353 is a prime.

It is a super-2 number, since 2×38721155855481² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38721155855483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195561393111 + ... + 195561393308.

It is an arithmetic number, because the mean of its divisors is an integer number (5084596223460).

Almost surely, 2^{38721155855481} is an apocalyptic number.

It is an amenable number.

38721155855481 is a deficient number, since it is larger than the sum of its proper divisors (22293998826039).

38721155855481 is a wasteful number, since it uses less digits than its factorization.

38721155855481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391122786436 (or 391122786433 counting only the distinct ones).

The product of its digits is 53760000, while the sum is 63.

The spelling of 38721155855481 in words is "thirty-eight trillion, seven hundred twenty-one billion, one hundred fifty-five million, eight hundred fifty-five thousand, four hundred eighty-one".