660469693 has 16 divisors (see below), whose sum is σ = 736933680. Its totient is φ = 587736576.

The previous prime is 660469687. The next prime is 660469717. The reversal of 660469693 is 396964066.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 127644804 + 532824889 = 11298^2 + 23083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660469693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660469613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412771 + ... + 414367.

It is an arithmetic number, because the mean of its divisors is an integer number (46058355).

Almost surely, 2^660469693 is an apocalyptic number.

It is an amenable number.

660469693 is a deficient number, since it is larger than the sum of its proper divisors (76463987).

660469693 is a wasteful number, since it uses less digits than its factorization.

660469693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 1259712, while the sum is 49.

The square root of 660469693 is about 25699.6049191422. The cubic root of 660469693 is about 870.8652566723.

The spelling of 660469693 in words is "six hundred sixty million, four hundred sixty-nine thousand, six hundred ninety-three".