1782116993 has 6 divisors (see below), whose sum is σ = 1798939506. Its totient is φ = 1765450352.

The previous prime is 1782116977. The next prime is 1782117041. The reversal of 1782116993 is 3996112871.

It can be written as a sum of positive squares in only one way, i.e., 1394499649 + 387617344 = 37343^2 + 19688^2 .

It is not a de Polignac number, because 1782116993 - 2⁴ = 1782116977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1782116923) 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, 66380 + ... + 89277.

It is an arithmetic number, because the mean of its divisors is an integer number (299823251).

Almost surely, 2^1782116993 is an apocalyptic number.

It is an amenable number.

1782116993 is a deficient number, since it is larger than the sum of its proper divisors (16822513).

1782116993 is an equidigital number, since it uses as much as digits as its factorization.

1782116993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155871 (or 155764 counting only the distinct ones).

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

The square root of 1782116993 is about 42215.1275374125. The cubic root of 1782116993 is about 1212.3985374127.

The spelling of 1782116993 in words is "one billion, seven hundred eighty-two million, one hundred sixteen thousand, nine hundred ninety-three".