1220743006605 has 12 divisors (see below), whose sum is σ = 2115954544860. Its totient is φ = 651062936832.

The previous prime is 1220743006597. The next prime is 1220743006627. The reversal of 1220743006605 is 5066003470221.

1220743006605 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 7 + 43 + 0 + 0 + 6 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 198967739364 + 1021775267241 = 446058^2 + 1010829^2 .

It is not a de Polignac number, because 1220743006605 - 2³ = 1220743006597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220743006605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13563811140 + ... + 13563811229.

It is an arithmetic number, because the mean of its divisors is an integer number (176329545405).

Almost surely, 2^{1220743006605} is an apocalyptic number.

1220743006605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220743006605 is a deficient number, since it is larger than the sum of its proper divisors (895211538255).

1220743006605 is a wasteful number, since it uses less digits than its factorization.

1220743006605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27127622380 (or 27127622377 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

Adding to 1220743006605 its reverse (5066003470221), we get a palindrome (6286746476826).

The spelling of 1220743006605 in words is "one trillion, two hundred twenty billion, seven hundred forty-three million, six thousand, six hundred five".