216155957 has 2 divisors, whose sum is σ = 216155958. Its totient is φ = 216155956.

The previous prime is 216155921. The next prime is 216155959. The reversal of 216155957 is 759551612.

216155957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210801361 + 5354596 = 14519^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 216155957 - 2¹⁶ = 216090421 is a prime.

Together with 216155959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216155959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108077978 + 108077979.

It is an arithmetic number, because the mean of its divisors is an integer number (108077979).

Almost surely, 2^216155957 is an apocalyptic number.

It is an amenable number.

216155957 is a deficient number, since it is larger than the sum of its proper divisors (1).

216155957 is an equidigital number, since it uses as much as digits as its factorization.

216155957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94500, while the sum is 41.

The square root of 216155957 is about 14702.2432642097. The cubic root of 216155957 is about 600.1443698891.

It can be divided in two parts, 21615 and 5957, that added together give a palindrome (27572).

The spelling of 216155957 in words is "two hundred sixteen million, one hundred fifty-five thousand, nine hundred fifty-seven".