660780568 has 16 divisors (see below), whose sum is σ = 1415958480. Its totient is φ = 283191648.

The previous prime is 660780557. The next prime is 660780577. The reversal of 660780568 is 865087066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5899771 + ... + 5899882.

It is an arithmetic number, because the mean of its divisors is an integer number (88497405).

Almost surely, 2^660780568 is an apocalyptic number.

It is an amenable number.

660780568 is an abundant number, since it is smaller than the sum of its proper divisors (755177912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660780568 is a wasteful number, since it uses less digits than its factorization.

660780568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11799666 (or 11799662 counting only the distinct ones).

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

The square root of 660780568 is about 25705.6524523304. The cubic root of 660780568 is about 871.0018704459.

The spelling of 660780568 in words is "six hundred sixty million, seven hundred eighty thousand, five hundred sixty-eight".