1781794082409 has 24 divisors (see below), whose sum is σ = 2635291834560. Its totient is φ = 1069968065760.

The previous prime is 1781794082401. The next prime is 1781794082417. The reversal of 1781794082409 is 9042804971871.

It is an interprime number because it is at equal distance from previous prime (1781794082401) and next prime (1781794082417).

It is not a de Polignac number, because 1781794082409 - 2³ = 1781794082401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1781794082401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22476597 + ... + 22555730.

It is an arithmetic number, because the mean of its divisors is an integer number (109803826440).

Almost surely, 2^{1781794082409} is an apocalyptic number.

It is an amenable number.

1781794082409 is a deficient number, since it is larger than the sum of its proper divisors (853497752151).

1781794082409 is a wasteful number, since it uses less digits than its factorization.

1781794082409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45032461 (or 45032450 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 60.

The spelling of 1781794082409 in words is "one trillion, seven hundred eighty-one billion, seven hundred ninety-four million, eighty-two thousand, four hundred nine".