1663665412 has 12 divisors (see below), whose sum is σ = 2922486336. Its totient is φ = 828669320.

The previous prime is 1663665379. The next prime is 1663665413. The reversal of 1663665412 is 2145663661.

It is not an unprimeable number, because it can be changed into a prime (1663665413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789664 + ... + 791767.

It is an arithmetic number, because the mean of its divisors is an integer number (243540528).

Almost surely, 2^1663665412 is an apocalyptic number.

It is an amenable number.

1663665412 is a deficient number, since it is larger than the sum of its proper divisors (1258820924).

1663665412 is a wasteful number, since it uses less digits than its factorization.

1663665412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581698 (or 1581696 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 1663665412 is about 40788.0547709743. The cubic root of 1663665412 is about 1184.9189977093.

The spelling of 1663665412 in words is "one billion, six hundred sixty-three million, six hundred sixty-five thousand, four hundred twelve".