660563870 has 16 divisors (see below), whose sum is σ = 1189829088. Its totient is φ = 264044640.

The previous prime is 660563867. The next prime is 660563873. The reversal of 660563870 is 78365066.

It is an interprime number because it is at equal distance from previous prime (660563867) and next prime (660563873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660563873) 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, 6749 + ... + 36968.

It is an arithmetic number, because the mean of its divisors is an integer number (74364318).

Almost surely, 2^660563870 is an apocalyptic number.

660563870 is a deficient number, since it is larger than the sum of its proper divisors (529265218).

660563870 is a wasteful number, since it uses less digits than its factorization.

660563870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45235.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 660563870 is about 25701.4371193519. The cubic root of 660563870 is about 870.9066472061.

The spelling of 660563870 in words is "six hundred sixty million, five hundred sixty-three thousand, eight hundred seventy".