381655865320 has 192 divisors, whose sum is σ = 923334163200. Its totient is φ = 141746357760.

The previous prime is 381655865317. The next prime is 381655865329. The reversal of 381655865320 is 23568556183.

It is a super-2 number, since 2×381655865320² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381655865329) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 189783115 + ... + 189785125.

It is an arithmetic number, because the mean of its divisors is an integer number (4809032100).

Almost surely, 2^381655865320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381655865320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461667081600).

381655865320 is an abundant number, since it is smaller than the sum of its proper divisors (541678297880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381655865320 is a wasteful number, since it uses less digits than its factorization.

381655865320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 381655865320 in words is "three hundred eighty-one billion, six hundred fifty-five million, eight hundred sixty-five thousand, three hundred twenty".