385221566 has 8 divisors (see below), whose sum is σ = 578108664. Its totient is φ = 192518680.

The previous prime is 385221559. The next prime is 385221569. The reversal of 385221566 is 665122583.

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

It is a super-2 number, since 2×385221566² = 296791309822984712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385221569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40700 + ... + 49263.

It is an arithmetic number, because the mean of its divisors is an integer number (72263583).

Almost surely, 2^385221566 is an apocalyptic number.

385221566 is a deficient number, since it is larger than the sum of its proper divisors (192887098).

385221566 is a wasteful number, since it uses less digits than its factorization.

385221566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92106.

The product of its digits is 86400, while the sum is 38.

The square root of 385221566 is about 19627.0620827469. The cubic root of 385221566 is about 727.6181618235.

The spelling of 385221566 in words is "three hundred eighty-five million, two hundred twenty-one thousand, five hundred sixty-six".