216600677 has 2 divisors, whose sum is σ = 216600678. Its totient is φ = 216600676.

The previous prime is 216600653. The next prime is 216600679. The reversal of 216600677 is 776006612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157602916 + 58997761 = 12554^2 + 7681^2 .

It is a cyclic number.

It is not a de Polignac number, because 216600677 - 2⁶ = 216600613 is a prime.

Together with 216600679, 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 (216600679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108300338 + 108300339.

It is an arithmetic number, because the mean of its divisors is an integer number (108300339).

Almost surely, 2^216600677 is an apocalyptic number.

It is an amenable number.

216600677 is a deficient number, since it is larger than the sum of its proper divisors (1).

216600677 is an equidigital number, since it uses as much as digits as its factorization.

216600677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 216600677 is about 14717.3597156555. The cubic root of 216600677 is about 600.5556676377. Note that the first 3 decimals are identical.

The spelling of 216600677 in words is "two hundred sixteen million, six hundred thousand, six hundred seventy-seven".