216346742009 has 2 divisors, whose sum is σ = 216346742010. Its totient is φ = 216346742008.

The previous prime is 216346741973. The next prime is 216346742011. The reversal of 216346742009 is 900247643612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169519945984 + 46826796025 = 411728^2 + 216395^2 .

It is a cyclic number.

It is not a de Polignac number, because 216346742009 - 2⁸ = 216346741753 is a prime.

Together with 216346742011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216346742039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108173371004 + 108173371005.

It is an arithmetic number, because the mean of its divisors is an integer number (108173371005).

Almost surely, 2^216346742009 is an apocalyptic number.

It is an amenable number.

216346742009 is a deficient number, since it is larger than the sum of its proper divisors (1).

216346742009 is an equidigital number, since it uses as much as digits as its factorization.

216346742009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 216346742009 in words is "two hundred sixteen billion, three hundred forty-six million, seven hundred forty-two thousand, nine".