665209480319 has 4 divisors (see below), whose sum is σ = 668884671000. Its totient is φ = 661534289640.

The previous prime is 665209480283. The next prime is 665209480357. The reversal of 665209480319 is 913084902566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913084902566 = 2 ⋅456542451283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665209480319 is a prime.

It is a super-2 number, since 2×665209480319² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665209410319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1837595069 + ... + 1837595430.

It is an arithmetic number, because the mean of its divisors is an integer number (167221167750).

Almost surely, 2^665209480319 is an apocalyptic number.

665209480319 is a deficient number, since it is larger than the sum of its proper divisors (3675190681).

665209480319 is a wasteful number, since it uses less digits than its factorization.

665209480319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675190680.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 665209480319 in words is "six hundred sixty-five billion, two hundred nine million, four hundred eighty thousand, three hundred nineteen".