655685865798 has 16 divisors (see below), whose sum is σ = 1313038032960. Its totient is φ = 218284238376.

The previous prime is 655685865773. The next prime is 655685865833. The reversal of 655685865798 is 897568586556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69424108 + ... + 69433551.

It is an arithmetic number, because the mean of its divisors is an integer number (82064877060).

Almost surely, 2^655685865798 is an apocalyptic number.

655685865798 is an abundant number, since it is smaller than the sum of its proper divisors (657352167162).

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

655685865798 is a wasteful number, since it uses less digits than its factorization.

655685865798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138858451.

The product of its digits is 4354560000, while the sum is 78.

The spelling of 655685865798 in words is "six hundred fifty-five billion, six hundred eighty-five million, eight hundred sixty-five thousand, seven hundred ninety-eight".