6381821366 has 8 divisors (see below), whose sum is σ = 9574335840. Its totient is φ = 3190376088.

The previous prime is 6381821357. The next prime is 6381821387. The reversal of 6381821366 is 6631281836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252206 + ... + 276353.

It is an arithmetic number, because the mean of its divisors is an integer number (1196791980).

Almost surely, 2^6381821366 is an apocalyptic number.

6381821366 is a deficient number, since it is larger than the sum of its proper divisors (3192514474).

6381821366 is a wasteful number, since it uses less digits than its factorization.

6381821366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534598.

The product of its digits is 248832, while the sum is 44.

The square root of 6381821366 is about 79886.3027433364. The cubic root of 6381821366 is about 1854.8759967771.

It can be divided in two parts, 63818 and 21366, that added together give a cube (85184 = 44³).

The spelling of 6381821366 in words is "six billion, three hundred eighty-one million, eight hundred twenty-one thousand, three hundred sixty-six".