665641163453 has 4 divisors (see below), whose sum is σ = 760732758240. Its totient is φ = 570549568668.

The previous prime is 665641163449. The next prime is 665641163479. The reversal of 665641163453 is 354361146566.

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.

It is a cyclic number.

It is not a de Polignac number, because 665641163453 - 2² = 665641163449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665641163413) 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, 47545797383 + ... + 47545797396.

It is an arithmetic number, because the mean of its divisors is an integer number (190183189560).

Almost surely, 2^665641163453 is an apocalyptic number.

It is an amenable number.

665641163453 is a deficient number, since it is larger than the sum of its proper divisors (95091594787).

665641163453 is an equidigital number, since it uses as much as digits as its factorization.

665641163453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95091594786.

The product of its digits is 4665600, while the sum is 50.

The spelling of 665641163453 in words is "six hundred sixty-five billion, six hundred forty-one million, one hundred sixty-three thousand, four hundred fifty-three".