1798638663 has 16 divisors (see below), whose sum is σ = 2510378496. Its totient is φ = 1143325920.

The previous prime is 1798638661. The next prime is 1798638679. The reversal of 1798638663 is 3668368971.

It is not a de Polignac number, because 1798638663 - 2¹ = 1798638661 is a prime.

It is a super-3 number, since 3×1798638663³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798638661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19243 + ... + 62988.

It is an arithmetic number, because the mean of its divisors is an integer number (156898656).

Almost surely, 2^1798638663 is an apocalyptic number.

1798638663 is a deficient number, since it is larger than the sum of its proper divisors (711739833).

1798638663 is a wasteful number, since it uses less digits than its factorization.

1798638663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82574.

The product of its digits is 7838208, while the sum is 57.

The square root of 1798638663 is about 42410.3603262222. The cubic root of 1798638663 is about 1216.1336578236.

The spelling of 1798638663 in words is "one billion, seven hundred ninety-eight million, six hundred thirty-eight thousand, six hundred sixty-three".