1663856930 has 16 divisors (see below), whose sum is σ = 2998452600. Its totient is φ = 664762752.

The previous prime is 1663856911. The next prime is 1663856939. The reversal of 1663856930 is 396583661.

It can be written as a sum of positive squares in 4 ways, for example, as 1164379129 + 499477801 = 34123^2 + 22349^2 .

It is not an unprimeable number, because it can be changed into a prime (1663856939) 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 7 ways as a sum of consecutive naturals, for example, 88505 + ... + 105644.

Almost surely, 2^1663856930 is an apocalyptic number.

1663856930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663856930 is a deficient number, since it is larger than the sum of its proper divisors (1334595670).

1663856930 is a wasteful number, since it uses less digits than its factorization.

1663856930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195013.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1663856930 is about 40790.4024250803. The cubic root of 1663856930 is about 1184.9644645055.

The spelling of 1663856930 in words is "one billion, six hundred sixty-three million, eight hundred fifty-six thousand, nine hundred thirty".