665749788 has 48 divisors (see below), whose sum is σ = 1719951744. Its totient is φ = 198728640.

The previous prime is 665749757. The next prime is 665749793. The reversal of 665749788 is 887947566.

665749788 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28795 + ... + 46482.

It is an arithmetic number, because the mean of its divisors is an integer number (35832328).

Almost surely, 2^665749788 is an apocalyptic number.

It is an amenable number.

665749788 is an abundant number, since it is smaller than the sum of its proper divisors (1054201956).

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

665749788 is a wasteful number, since it uses less digits than its factorization.

665749788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75362 (or 75360 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 60.

The square root of 665749788 is about 25802.1275866933. The cubic root of 665749788 is about 873.1797973526.

The spelling of 665749788 in words is "six hundred sixty-five million, seven hundred forty-nine thousand, seven hundred eighty-eight".