6615221382 has 72 divisors (see below), whose sum is σ = 18188817192. Its totient is φ = 1718236800.

The previous prime is 6615221329. The next prime is 6615221399. The reversal of 6615221382 is 2831225166.

6615221382 is a `hidden beast` number, since 6 + 615 + 2 + 2 + 1 + 38 + 2 = 666.

It is a super-2 number, since 2×6615221382² = 87522307865739979848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 331219 + ... + 350622.

It is an arithmetic number, because the mean of its divisors is an integer number (252622461).

Almost surely, 2^6615221382 is an apocalyptic number.

6615221382 is an abundant number, since it is smaller than the sum of its proper divisors (11573595810).

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

6615221382 is a wasteful number, since it uses less digits than its factorization.

6615221382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681874 (or 681864 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6615221382 is about 81334.0112253171. The cubic root of 6615221382 is about 1877.2183646493.

The spelling of 6615221382 in words is "six billion, six hundred fifteen million, two hundred twenty-one thousand, three hundred eighty-two".