216163766 has 32 divisors (see below), whose sum is σ = 401163840. Its totient is φ = 85067136.

The previous prime is 216163711. The next prime is 216163769. The reversal of 216163766 is 667361612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216163769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32840 + ... + 38868.

It is an arithmetic number, because the mean of its divisors is an integer number (12536370).

Almost surely, 2^216163766 is an apocalyptic number.

216163766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216163766 is a deficient number, since it is larger than the sum of its proper divisors (185000074).

216163766 is a wasteful number, since it uses less digits than its factorization.

216163766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6248.

The product of its digits is 54432, while the sum is 38.

The square root of 216163766 is about 14702.5088335291. The cubic root of 216163766 is about 600.1515968793.

The spelling of 216163766 in words is "two hundred sixteen million, one hundred sixty-three thousand, seven hundred sixty-six".