661733868 has 48 divisors (see below), whose sum is σ = 1594736640. Its totient is φ = 213442944.

The previous prime is 661733867. The next prime is 661733893. The reversal of 661733868 is 868337166.

661733868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (661733867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43605 + ... + 56787.

It is an arithmetic number, because the mean of its divisors is an integer number (33223680).

Almost surely, 2^661733868 is an apocalyptic number.

It is an amenable number.

661733868 is an abundant number, since it is smaller than the sum of its proper divisors (933002772).

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

661733868 is a wasteful number, since it uses less digits than its factorization.

661733868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13326 (or 13324 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 661733868 is about 25724.1883836983. The cubic root of 661733868 is about 871.4205304079.

The spelling of 661733868 in words is "six hundred sixty-one million, seven hundred thirty-three thousand, eight hundred sixty-eight".