1983751663 has 4 divisors (see below), whose sum is σ = 1983840760. Its totient is φ = 1983662568.

The previous prime is 1983751661. The next prime is 1983751669. The reversal of 1983751663 is 3661573891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3661573891 = 173 ⋅21165167.

It is a cyclic number.

It is not a de Polignac number, because 1983751663 - 2¹ = 1983751661 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 (1983751661) 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, 20956 + ... + 66382.

It is an arithmetic number, because the mean of its divisors is an integer number (495960190).

Almost surely, 2^1983751663 is an apocalyptic number.

1983751663 is a deficient number, since it is larger than the sum of its proper divisors (89097).

1983751663 is an equidigital number, since it uses as much as digits as its factorization.

1983751663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89096.

The product of its digits is 816480, while the sum is 49.

The square root of 1983751663 is about 44539.3271502837. The cubic root of 1983751663 is about 1256.4998312792.

The spelling of 1983751663 in words is "one billion, nine hundred eighty-three million, seven hundred fifty-one thousand, six hundred sixty-three".