665134702753 has 4 divisors (see below), whose sum is σ = 666760949380. Its totient is φ = 663508456128.

The previous prime is 665134702721. The next prime is 665134702763. The reversal of 665134702753 is 357207431566.

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 601722901264 + 63411801489 = 775708^2 + 251817^2 .

It is a cyclic number.

It is not a de Polignac number, because 665134702753 - 2⁵ = 665134702721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665134702697 and 665134702706.

It is not an unprimeable number, because it can be changed into a prime (665134702763) 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, 813122700 + ... + 813123517.

It is an arithmetic number, because the mean of its divisors is an integer number (166690237345).

Almost surely, 2^665134702753 is an apocalyptic number.

It is an amenable number.

665134702753 is a deficient number, since it is larger than the sum of its proper divisors (1626246627).

665134702753 is a wasteful number, since it uses less digits than its factorization.

665134702753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626246626.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 665134702753 in words is "six hundred sixty-five billion, one hundred thirty-four million, seven hundred two thousand, seven hundred fifty-three".