660856870 has 8 divisors (see below), whose sum is σ = 1189542384. Its totient is φ = 264342744.

The previous prime is 660856787. The next prime is 660856871. The reversal of 660856870 is 78658066.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 660856870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660856871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33042834 + ... + 33042853.

It is an arithmetic number, because the mean of its divisors is an integer number (148692798).

Almost surely, 2^660856870 is an apocalyptic number.

660856870 is a deficient number, since it is larger than the sum of its proper divisors (528685514).

660856870 is a wasteful number, since it uses less digits than its factorization.

660856870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66085694.

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 660856870 is about 25707.1365577732. The cubic root of 660856870 is about 871.0353947504.

The spelling of 660856870 in words is "six hundred sixty million, eight hundred fifty-six thousand, eight hundred seventy".