1220565667 has 2 divisors, whose sum is σ = 1220565668. Its totient is φ = 1220565666.

The previous prime is 1220565637. The next prime is 1220565683. The reversal of 1220565667 is 7665650221.

It is a strong prime.

It is an emirp because it is prime and its reverse (7665650221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220565667 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220565637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610282833 + 610282834.

It is an arithmetic number, because the mean of its divisors is an integer number (610282834).

Almost surely, 2^1220565667 is an apocalyptic number.

1220565667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220565667 is an equidigital number, since it uses as much as digits as its factorization.

1220565667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1220565667 is about 34936.5949542883. The cubic root of 1220565667 is about 1068.6948499887.

The spelling of 1220565667 in words is "one billion, two hundred twenty million, five hundred sixty-five thousand, six hundred sixty-seven".