665474860839 has 16 divisors (see below), whose sum is σ = 890161332224. Its totient is φ = 442219694400.

The previous prime is 665474860793. The next prime is 665474860849. The reversal of 665474860839 is 938068474566.

665474860839 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 665474860839 - 2⁹ = 665474860327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665474860839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665474860849) 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, 5011674 + ... + 5142744.

It is an arithmetic number, because the mean of its divisors is an integer number (55635083264).

Almost surely, 2^665474860839 is an apocalyptic number.

665474860839 is a deficient number, since it is larger than the sum of its proper divisors (224686471385).

665474860839 is a wasteful number, since it uses less digits than its factorization.

665474860839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136518.

The product of its (nonzero) digits is 209018880, while the sum is 66.

The spelling of 665474860839 in words is "six hundred sixty-five billion, four hundred seventy-four million, eight hundred sixty thousand, eight hundred thirty-nine".