660506878 has 4 divisors (see below), whose sum is σ = 990760320. Its totient is φ = 330253438.

The previous prime is 660506851. The next prime is 660506897. The reversal of 660506878 is 878605066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165126718 + ... + 165126721.

It is an arithmetic number, because the mean of its divisors is an integer number (247690080).

Almost surely, 2^660506878 is an apocalyptic number.

660506878 is a deficient number, since it is larger than the sum of its proper divisors (330253442).

660506878 is a wasteful number, since it uses less digits than its factorization.

660506878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330253441.

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

The square root of 660506878 is about 25700.3283636610. The cubic root of 660506878 is about 870.8815998481.

The spelling of 660506878 in words is "six hundred sixty million, five hundred six thousand, eight hundred seventy-eight".