665408880653 has 16 divisors (see below), whose sum is σ = 734217307200. Its totient is φ = 597989546880.

The previous prime is 665408880649. The next prime is 665408880683. The reversal of 665408880653 is 356088804566.

665408880653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665408880653 - 2² = 665408880649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665408880592 and 665408880601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665408880683) 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, 4551863 + ... + 4695771.

It is an arithmetic number, because the mean of its divisors is an integer number (45888581700).

Almost surely, 2^665408880653 is an apocalyptic number.

It is an amenable number.

665408880653 is a deficient number, since it is larger than the sum of its proper divisors (68808426547).

665408880653 is a wasteful number, since it uses less digits than its factorization.

665408880653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148732.

The product of its (nonzero) digits is 33177600, while the sum is 59.

The spelling of 665408880653 in words is "six hundred sixty-five billion, four hundred eight million, eight hundred eighty thousand, six hundred fifty-three".