665146806623 has 16 divisors (see below), whose sum is σ = 720112417920. Its totient is φ = 610724911104.

The previous prime is 665146806619. The next prime is 665146806719. The reversal of 665146806623 is 326608641566.

It is a cyclic number.

It is not a de Polignac number, because 665146806623 - 2² = 665146806619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665149806623) 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, 36479273 + ... + 36497501.

It is an arithmetic number, because the mean of its divisors is an integer number (45007026120).

Almost surely, 2^665146806623 is an apocalyptic number.

665146806623 is a deficient number, since it is larger than the sum of its proper divisors (54965611297).

665146806623 is a wasteful number, since it uses less digits than its factorization.

665146806623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32978.

The product of its (nonzero) digits is 7464960, while the sum is 53.

The spelling of 665146806623 in words is "six hundred sixty-five billion, one hundred forty-six million, eight hundred six thousand, six hundred twenty-three".