655765569408 has 128 divisors (see below), whose sum is σ = 1822293158400. Its totient is φ = 208546088960.

The previous prime is 655765569391. The next prime is 655765569409. The reversal of 655765569408 is 804965567556.

655765569408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655765569409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3340213 + ... + 3531083.

It is an arithmetic number, because the mean of its divisors is an integer number (14236665300).

Almost surely, 2^655765569408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655765569408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (911146579200).

655765569408 is an abundant number, since it is smaller than the sum of its proper divisors (1166527588992).

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

655765569408 is a wasteful number, since it uses less digits than its factorization.

655765569408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191300 (or 191288 counting only the distinct ones).

The product of its (nonzero) digits is 272160000, while the sum is 66.

The spelling of 655765569408 in words is "six hundred fifty-five billion, seven hundred sixty-five million, five hundred sixty-nine thousand, four hundred eight".