1009780106609 has 6 divisors (see below), whose sum is σ = 1012681871910. Its totient is φ = 1006886632416.

The previous prime is 1009780106557. The next prime is 1009780106611. The reversal of 1009780106609 is 9066010879001.

It can be written as a sum of positive squares in 3 ways, for example, as 675401261584 + 334378845025 = 821828^2 + 578255^2 .

It is not a de Polignac number, because 1009780106609 - 2³² = 1005485139313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009780106639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4023404 + ... + 4267005.

It is an arithmetic number, because the mean of its divisors is an integer number (168780311985).

Almost surely, 2^{1009780106609} is an apocalyptic number.

It is an amenable number.

1009780106609 is a deficient number, since it is larger than the sum of its proper divisors (2901765301).

1009780106609 is an frugal number, since it uses more digits than its factorization.

1009780106609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8291107 (or 8290758 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 1009780106609 in words is "one trillion, nine billion, seven hundred eighty million, one hundred six thousand, six hundred nine".