1983823635709 has 4 divisors (see below), whose sum is σ = 1983826585116. Its totient is φ = 1983820686304.

The previous prime is 1983823635707. The next prime is 1983823635713. The reversal of 1983823635709 is 9075363283891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1344138796900 + 639684838809 = 1159370^2 + 799803^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983823635709 - 2¹ = 1983823635707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983823635707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81927 + ... + 1993579.

It is an arithmetic number, because the mean of its divisors is an integer number (495956646279).

Almost surely, 2^{1983823635709} is an apocalyptic number.

It is an amenable number.

1983823635709 is a deficient number, since it is larger than the sum of its proper divisors (2949407).

1983823635709 is a wasteful number, since it uses less digits than its factorization.

1983823635709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2949406.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 1983823635709 in words is "one trillion, nine hundred eighty-three billion, eight hundred twenty-three million, six hundred thirty-five thousand, seven hundred nine".