65561219 has 2 divisors, whose sum is σ = 65561220. Its totient is φ = 65561218.

The previous prime is 65561207. The next prime is 65561239. The reversal of 65561219 is 91216556.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65561219 is a prime.

It is a super-2 number, since 2×65561219² = 8596546873531922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65561239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780609 + 32780610.

It is an arithmetic number, because the mean of its divisors is an integer number (32780610).

Almost surely, 2^65561219 is an apocalyptic number.

65561219 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561219 is an equidigital number, since it uses as much as digits as its factorization.

65561219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 65561219 is about 8096.9882672510. The cubic root of 65561219 is about 403.2264447459.

The spelling of 65561219 in words is "sixty-five million, five hundred sixty-one thousand, two hundred nineteen".