665656361 has 8 divisors (see below), whose sum is σ = 682383744. Its totient is φ = 648952480.

The previous prime is 665656337. The next prime is 665656367. The reversal of 665656361 is 163656566.

665656361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665656361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665656367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60836 + ... + 70938.

It is an arithmetic number, because the mean of its divisors is an integer number (85297968).

Almost surely, 2^665656361 is an apocalyptic number.

It is an amenable number.

665656361 is a deficient number, since it is larger than the sum of its proper divisors (16727383).

665656361 is a wasteful number, since it uses less digits than its factorization.

665656361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11751.

The product of its digits is 583200, while the sum is 44.

The square root of 665656361 is about 25800.3170716951. The cubic root of 665656361 is about 873.1389499818.

The spelling of 665656361 in words is "six hundred sixty-five million, six hundred fifty-six thousand, three hundred sixty-one".