1661863568 has 20 divisors (see below), whose sum is σ = 3222845808. Its totient is φ = 830161440.

The previous prime is 1661863549. The next prime is 1661863579. The reversal of 1661863568 is 8653681661.

It is an unprimeable number.

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, 30146 + ... + 65057.

Almost surely, 2^1661863568 is an apocalyptic number.

It is an amenable number.

1661863568 is a deficient number, since it is larger than the sum of its proper divisors (1560982240).

1661863568 is a wasteful number, since it uses less digits than its factorization.

1661863568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96302 (or 96296 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 50.

The square root of 1661863568 is about 40765.9608987695. The cubic root of 1661863568 is about 1184.4910650202.

The spelling of 1661863568 in words is "one billion, six hundred sixty-one million, eight hundred sixty-three thousand, five hundred sixty-eight".