665051566219 has 4 divisors (see below), whose sum is σ = 667955721760. Its totient is φ = 662147410680.

The previous prime is 665051566217. The next prime is 665051566229. The reversal of 665051566219 is 912665150566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665051566219 - 2¹ = 665051566217 is a prime.

It is a super-2 number, since 2×665051566219² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665051566213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452077427 + ... + 1452077884.

It is an arithmetic number, because the mean of its divisors is an integer number (166988930440).

Almost surely, 2^665051566219 is an apocalyptic number.

665051566219 is a deficient number, since it is larger than the sum of its proper divisors (2904155541).

665051566219 is a wasteful number, since it uses less digits than its factorization.

665051566219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904155540.

The product of its (nonzero) digits is 2916000, while the sum is 52.

The spelling of 665051566219 in words is "six hundred sixty-five billion, fifty-one million, five hundred sixty-six thousand, two hundred nineteen".