216156623 has 2 divisors, whose sum is σ = 216156624. Its totient is φ = 216156622.

The previous prime is 216156607. The next prime is 216156697. The reversal of 216156623 is 326651612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216156623 - 2⁴ = 216156607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216156623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216152623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108078311 + 108078312.

It is an arithmetic number, because the mean of its divisors is an integer number (108078312).

Almost surely, 2^216156623 is an apocalyptic number.

216156623 is a deficient number, since it is larger than the sum of its proper divisors (1).

216156623 is an equidigital number, since it uses as much as digits as its factorization.

216156623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 216156623 is about 14702.2659137971. The cubic root of 216156623 is about 600.1449862584.

The spelling of 216156623 in words is "two hundred sixteen million, one hundred fifty-six thousand, six hundred twenty-three".