665170516133 has 4 divisors (see below), whose sum is σ = 666750494028. Its totient is φ = 663590538240.

The previous prime is 665170516099. The next prime is 665170516169. The reversal of 665170516133 is 331615071566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170881370884 + 494289145249 = 413378^2 + 703057^2 .

It is a cyclic number.

It is not a de Polignac number, because 665170516133 - 2³⁴ = 647990646949 is a prime.

It is a super-2 number, since 2×665170516133² (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 (665170516193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789988316 + ... + 789989157.

It is an arithmetic number, because the mean of its divisors is an integer number (166687623507).

Almost surely, 2^665170516133 is an apocalyptic number.

It is an amenable number.

665170516133 is a deficient number, since it is larger than the sum of its proper divisors (1579977895).

665170516133 is a wasteful number, since it uses less digits than its factorization.

665170516133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579977894.

The product of its (nonzero) digits is 340200, while the sum is 44.

Adding to 665170516133 its reverse (331615071566), we get a palindrome (996785587699).

The spelling of 665170516133 in words is "six hundred sixty-five billion, one hundred seventy million, five hundred sixteen thousand, one hundred thirty-three".