665746706 has 16 divisors (see below), whose sum is σ = 1017922464. Its totient is φ = 326482464.

The previous prime is 665746703. The next prime is 665746721. The reversal of 665746706 is 607647566.

It is not an unprimeable number, because it can be changed into a prime (665746703) 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 7 ways as a sum of consecutive naturals, for example, 20561 + ... + 41883.

It is an arithmetic number, because the mean of its divisors is an integer number (63620154).

Almost surely, 2^665746706 is an apocalyptic number.

665746706 is a deficient number, since it is larger than the sum of its proper divisors (352175758).

665746706 is a wasteful number, since it uses less digits than its factorization.

665746706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21625.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The square root of 665746706 is about 25802.0678628671. The cubic root of 665746706 is about 873.1784499273.

The spelling of 665746706 in words is "six hundred sixty-five million, seven hundred forty-six thousand, seven hundred six".