1663439996 has 6 divisors (see below), whose sum is σ = 2911020000. Its totient is φ = 831719996.

The previous prime is 1663439989. The next prime is 1663440011. The reversal of 1663439996 is 6999343661.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207929996 + ... + 207930003.

It is an arithmetic number, because the mean of its divisors is an integer number (485170000).

Almost surely, 2^1663439996 is an apocalyptic number.

It is an amenable number.

1663439996 is a deficient number, since it is larger than the sum of its proper divisors (1247580004).

1663439996 is a wasteful number, since it uses less digits than its factorization.

1663439996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415860003 (or 415860001 counting only the distinct ones).

The product of its digits is 5668704, while the sum is 56.

The square root of 1663439996 is about 40785.2914173725. The cubic root of 1663439996 is about 1184.8654789822.

The spelling of 1663439996 in words is "one billion, six hundred sixty-three million, four hundred thirty-nine thousand, nine hundred ninety-six".