38666812181 has 8 divisors (see below), whose sum is σ = 40834100160. Its totient is φ = 36540034432.

The previous prime is 38666812097. The next prime is 38666812183. The reversal of 38666812181 is 18121866683.

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 38666812181 - 2³⁰ = 37593070357 is a prime.

It is a super-2 number, since 2×38666812181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38666812183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10125596 + ... + 10129413.

It is an arithmetic number, because the mean of its divisors is an integer number (5104262520).

Almost surely, 2^38666812181 is an apocalyptic number.

It is an amenable number.

38666812181 is a deficient number, since it is larger than the sum of its proper divisors (2167287979).

38666812181 is a wasteful number, since it uses less digits than its factorization.

38666812181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20255115.

The product of its digits is 663552, while the sum is 50.

The spelling of 38666812181 in words is "thirty-eight billion, six hundred sixty-six million, eight hundred twelve thousand, one hundred eighty-one".