665430841573 has 4 divisors (see below), whose sum is σ = 668362255200. Its totient is φ = 662499427948.

The previous prime is 665430841571. The next prime is 665430841601. The reversal of 665430841573 is 375148034566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 375148034566 = 2 ⋅187574017283.

It is a cyclic number.

It is not a de Polignac number, because 665430841573 - 2¹ = 665430841571 is a prime.

It is a super-2 number, since 2×665430841573² (a number of 24 digits) contains 22 as substring.

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 665430841573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665430841571) 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, 1465706473 + ... + 1465706926.

It is an arithmetic number, because the mean of its divisors is an integer number (167090563800).

Almost surely, 2^665430841573 is an apocalyptic number.

It is an amenable number.

665430841573 is a deficient number, since it is larger than the sum of its proper divisors (2931413627).

665430841573 is a wasteful number, since it uses less digits than its factorization.

665430841573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931413626.

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 665430841573 in words is "six hundred sixty-five billion, four hundred thirty million, eight hundred forty-one thousand, five hundred seventy-three".