1663885956 has 48 divisors (see below), whose sum is σ = 3909914624. Its totient is φ = 550712736.

The previous prime is 1663885943. The next prime is 1663885957. The reversal of 1663885956 is 6595883661.

It is a junction number, because it is equal to n+sod(n) for n = 1663885896 and 1663885905.

It is not an unprimeable number, because it can be changed into a prime (1663885957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1720185 + ... + 1721151.

Almost surely, 2^1663885956 is an apocalyptic number.

It is an amenable number.

1663885956 is an abundant number, since it is smaller than the sum of its proper divisors (2246028668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663885956 is a wasteful number, since it uses less digits than its factorization.

1663885956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840 (or 1838 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 57.

The square root of 1663885956 is about 40790.7582180082. The cubic root of 1663885956 is about 1184.9713550376.

The spelling of 1663885956 in words is "one billion, six hundred sixty-three million, eight hundred eighty-five thousand, nine hundred fifty-six".