660494857 has 8 divisors (see below), whose sum is σ = 720964512. Its totient is φ = 600096000.

The previous prime is 660494839. The next prime is 660494867. The reversal of 660494857 is 758494066.

660494857 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 not a de Polignac number, because 660494857 - 2²³ = 652106249 is a prime.

It is a super-2 number, since 2×660494857² = 872506912246900898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 660494857.

It is not an unprimeable number, because it can be changed into a prime (660494867) 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, 2857 + ... + 36457.

It is an arithmetic number, because the mean of its divisors is an integer number (90120564).

Almost surely, 2^660494857 is an apocalyptic number.

It is an amenable number.

660494857 is a deficient number, since it is larger than the sum of its proper divisors (60469655).

660494857 is a wasteful number, since it uses less digits than its factorization.

660494857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35399.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 660494857 is about 25700.0944939897. The cubic root of 660494857 is about 870.8763165666.

The spelling of 660494857 in words is "six hundred sixty million, four hundred ninety-four thousand, eight hundred fifty-seven".