668487965 has 4 divisors (see below), whose sum is σ = 802185564. Its totient is φ = 534790368.

The previous prime is 668487947. The next prime is 668487973. The reversal of 668487965 is 569784866.

668487965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 311240164 + 357247801 = 17642^2 + 18901^2 .

It is a cyclic number.

It is not a de Polignac number, because 668487965 - 2¹⁰ = 668486941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66848792 + ... + 66848801.

It is an arithmetic number, because the mean of its divisors is an integer number (200546391).

Almost surely, 2^668487965 is an apocalyptic number.

It is an amenable number.

668487965 is a deficient number, since it is larger than the sum of its proper divisors (133697599).

668487965 is a wasteful number, since it uses less digits than its factorization.

668487965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133697598.

The product of its digits is 17418240, while the sum is 59.

The square root of 668487965 is about 25855.1342096691. The cubic root of 668487965 is about 874.3752667116.

It can be divided in two parts, 6684 and 87965, that added together give a palindrome (94649).

The spelling of 668487965 in words is "six hundred sixty-eight million, four hundred eighty-seven thousand, nine hundred sixty-five".