216158566 has 8 divisors (see below), whose sum is σ = 349179264. Its totient is φ = 99765480.

The previous prime is 216158533. The next prime is 216158599. The reversal of 216158566 is 665851612.

It is an interprime number because it is at equal distance from previous prime (216158533) and next prime (216158599).

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4156870 + ... + 4156921.

It is an arithmetic number, because the mean of its divisors is an integer number (43647408).

Almost surely, 2^216158566 is an apocalyptic number.

216158566 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216158566 is a deficient number, since it is larger than the sum of its proper divisors (133020698).

216158566 is a wasteful number, since it uses less digits than its factorization.

216158566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8313806.

The product of its digits is 86400, while the sum is 40.

The square root of 216158566 is about 14702.3319918984. The cubic root of 216158566 is about 600.1467844580.

The spelling of 216158566 in words is "two hundred sixteen million, one hundred fifty-eight thousand, five hundred sixty-six".