660465853 has 4 divisors (see below), whose sum is σ = 675825568. Its totient is φ = 645106140.

The previous prime is 660465823. The next prime is 660465857. The reversal of 660465853 is 358564066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660465853 - 2⁹ = 660465341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 15359671 = 660465853 / (6 + 6 + 0 + 4 + 6 + 5 + 8 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660465857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7679793 + ... + 7679878.

It is an arithmetic number, because the mean of its divisors is an integer number (168956392).

Almost surely, 2^660465853 is an apocalyptic number.

It is an amenable number.

660465853 is a deficient number, since it is larger than the sum of its proper divisors (15359715).

660465853 is a wasteful number, since it uses less digits than its factorization.

660465853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15359714.

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 660465853 is about 25699.5302097140. The cubic root of 660465853 is about 870.8635689193.

The spelling of 660465853 in words is "six hundred sixty million, four hundred sixty-five thousand, eight hundred fifty-three".