1996181663 has 4 divisors (see below), whose sum is σ = 2281350480. Its totient is φ = 1711012848.

The previous prime is 1996181659. The next prime is 1996181689. The reversal of 1996181663 is 3661816991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1996181663 - 2² = 1996181659 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 (1996181963) 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, 142584398 + ... + 142584411.

It is an arithmetic number, because the mean of its divisors is an integer number (570337620).

Almost surely, 2^1996181663 is an apocalyptic number.

1996181663 is a deficient number, since it is larger than the sum of its proper divisors (285168817).

1996181663 is an equidigital number, since it uses as much as digits as its factorization.

1996181663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285168816.

The product of its digits is 419904, while the sum is 50.

The square root of 1996181663 is about 44678.6488493106. The cubic root of 1996181663 is about 1259.1187385686.

The spelling of 1996181663 in words is "one billion, nine hundred ninety-six million, one hundred eighty-one thousand, six hundred sixty-three".