381655865321 has 8 divisors (see below), whose sum is σ = 386062482624. Its totient is φ = 377274501360.

The previous prime is 381655865317. The next prime is 381655865329. The reversal of 381655865321 is 123568556183.

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 381655865321 - 2² = 381655865317 is a prime.

It is a super-2 number, since 2×381655865321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381655865329) 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 7 ways as a sum of consecutive naturals, for example, 6282935 + ... + 6343388.

It is an arithmetic number, because the mean of its divisors is an integer number (48257810328).

Almost surely, 2^381655865321 is an apocalyptic number.

It is an amenable number.

381655865321 is a deficient number, since it is larger than the sum of its proper divisors (4406617303).

381655865321 is a wasteful number, since it uses less digits than its factorization.

381655865321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12626671.

The product of its digits is 5184000, while the sum is 53.

The spelling of 381655865321 in words is "three hundred eighty-one billion, six hundred fifty-five million, eight hundred sixty-five thousand, three hundred twenty-one".