216247492609 has 2 divisors, whose sum is σ = 216247492610. Its totient is φ = 216247492608.

The previous prime is 216247492553. The next prime is 216247492613. The reversal of 216247492609 is 906294742612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155198966209 + 61048526400 = 393953^2 + 247080^2 .

It is a cyclic number.

It is not a de Polignac number, because 216247492609 - 2⁷ = 216247492481 is a prime.

It is not a weakly prime, because it can be changed into another prime (216241492609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108123746304 + 108123746305.

It is an arithmetic number, because the mean of its divisors is an integer number (108123746305).

Almost surely, 2^216247492609 is an apocalyptic number.

It is an amenable number.

216247492609 is a deficient number, since it is larger than the sum of its proper divisors (1).

216247492609 is an equidigital number, since it uses as much as digits as its factorization.

216247492609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 216247492609 in words is "two hundred sixteen billion, two hundred forty-seven million, four hundred ninety-two thousand, six hundred nine".