665468750 has 32 divisors (see below), whose sum is σ = 1248043680. Its totient is φ = 266125000.

The previous prime is 665468719. The next prime is 665468773. The reversal of 665468750 is 57864566.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665468695 and 665468704.

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, 154121 + ... + 158379.

It is an arithmetic number, because the mean of its divisors is an integer number (39001365).

Almost surely, 2^665468750 is an apocalyptic number.

665468750 is a deficient number, since it is larger than the sum of its proper divisors (582574930).

665468750 is an frugal number, since it uses more digits than its factorization.

665468750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296 (or 4266 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The square root of 665468750 is about 25796.6809880651. The cubic root of 665468750 is about 873.0569127259.

The spelling of 665468750 in words is "six hundred sixty-five million, four hundred sixty-eight thousand, seven hundred fifty".