1663802823 has 4 divisors (see below), whose sum is σ = 2218403768. Its totient is φ = 1109201880.

The previous prime is 1663802821. The next prime is 1663802843. The reversal of 1663802823 is 3282083661.

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

It is not a de Polignac number, because 1663802823 - 2¹ = 1663802821 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 (1663802821) 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, 277300468 + ... + 277300473.

It is an arithmetic number, because the mean of its divisors is an integer number (554600942).

Almost surely, 2^1663802823 is an apocalyptic number.

1663802823 is a deficient number, since it is larger than the sum of its proper divisors (554600945).

1663802823 is an equidigital number, since it uses as much as digits as its factorization.

1663802823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554600944.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 1663802823 is about 40789.7391876928. The cubic root of 1663802823 is about 1184.9516197378.

The spelling of 1663802823 in words is "one billion, six hundred sixty-three million, eight hundred two thousand, eight hundred twenty-three".