1663711798 has 12 divisors (see below), whose sum is σ = 2903007492. Its totient is φ = 713019300.

The previous prime is 1663711789. The next prime is 1663711807. The reversal of 1663711798 is 8971173661.

It is an interprime number because it is at equal distance from previous prime (1663711789) and next prime (1663711807).

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8488228 + ... + 8488423.

It is an arithmetic number, because the mean of its divisors is an integer number (241917291).

Almost surely, 2^1663711798 is an apocalyptic number.

1663711798 is a deficient number, since it is larger than the sum of its proper divisors (1239295694).

1663711798 is a wasteful number, since it uses less digits than its factorization.

1663711798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16976667 (or 16976660 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 1663711798 is about 40788.6233893717. The cubic root of 1663711798 is about 1184.9300101683.

The spelling of 1663711798 in words is "one billion, six hundred sixty-three million, seven hundred eleven thousand, seven hundred ninety-eight".