665746753 has 16 divisors (see below), whose sum is σ = 794797056. Its totient is φ = 545236560.

The previous prime is 665746733. The next prime is 665746759. The reversal of 665746753 is 357647566.

It is a cyclic number.

It is not a de Polignac number, because 665746753 - 2⁵ = 665746721 is a prime.

It is a super-3 number, since 3×665746753³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665746697 and 665746706.

It is not an unprimeable number, because it can be changed into a prime (665746759) 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 15 ways as a sum of consecutive naturals, for example, 206250 + ... + 209452.

It is an arithmetic number, because the mean of its divisors is an integer number (49674816).

Almost surely, 2^665746753 is an apocalyptic number.

It is an amenable number.

665746753 is a deficient number, since it is larger than the sum of its proper divisors (129050303).

665746753 is a wasteful number, since it uses less digits than its factorization.

665746753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4524.

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

The square root of 665746753 is about 25802.0687736468. The cubic root of 665746753 is about 873.1784704753.

The spelling of 665746753 in words is "six hundred sixty-five million, seven hundred forty-six thousand, seven hundred fifty-three".