216626656 has 12 divisors (see below), whose sum is σ = 426483792. Its totient is φ = 108313312.

The previous prime is 216626653. The next prime is 216626671. The reversal of 216626656 is 656626612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216626651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3384760 + ... + 3384823.

It is an arithmetic number, because the mean of its divisors is an integer number (35540316).

Almost surely, 2^216626656 is an apocalyptic number.

It is an amenable number.

216626656 is a deficient number, since it is larger than the sum of its proper divisors (209857136).

216626656 is an equidigital number, since it uses as much as digits as its factorization.

216626656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6769593 (or 6769585 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 216626656 is about 14718.2422863601. The cubic root of 216626656 is about 600.5796768147.

The spelling of 216626656 in words is "two hundred sixteen million, six hundred twenty-six thousand, six hundred fifty-six".