1220165991439 has 2 divisors, whose sum is σ = 1220165991440. Its totient is φ = 1220165991438.

The previous prime is 1220165991437. The next prime is 1220165991461. The reversal of 1220165991439 is 9341995610221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220165991439 - 2¹ = 1220165991437 is a prime.

Together with 1220165991437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220165991437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610082995719 + 610082995720.

It is an arithmetic number, because the mean of its divisors is an integer number (610082995720).

Almost surely, 2^{1220165991439} is an apocalyptic number.

1220165991439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220165991439 is an equidigital number, since it uses as much as digits as its factorization.

1220165991439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 1220165991439 in words is "one trillion, two hundred twenty billion, one hundred sixty-five million, nine hundred ninety-one thousand, four hundred thirty-nine".