216409307357 has 2 divisors, whose sum is σ = 216409307358. Its totient is φ = 216409307356.

The previous prime is 216409307329. The next prime is 216409307377. The reversal of 216409307357 is 753703904612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167296542361 + 49112764996 = 409019^2 + 221614^2 .

It is a cyclic number.

It is not a de Polignac number, because 216409307357 - 2⁶ = 216409307293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216409307377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108204653678 + 108204653679.

It is an arithmetic number, because the mean of its divisors is an integer number (108204653679).

Almost surely, 2^216409307357 is an apocalyptic number.

It is an amenable number.

216409307357 is a deficient number, since it is larger than the sum of its proper divisors (1).

216409307357 is an equidigital number, since it uses as much as digits as its factorization.

216409307357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 216409307357 in words is "two hundred sixteen billion, four hundred nine million, three hundred seven thousand, three hundred fifty-seven".