655995912440 has 128 divisors (see below), whose sum is σ = 1626111832320. Its totient is φ = 236184960000.

The previous prime is 655995912371. The next prime is 655995912449. The reversal of 655995912440 is 44219599556.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 655995912440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655995912449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141284759 + ... + 141289401.

It is an arithmetic number, because the mean of its divisors is an integer number (12703998690).

Almost surely, 2^655995912440 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 655995912440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813055916160).

655995912440 is an abundant number, since it is smaller than the sum of its proper divisors (970115919880).

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

655995912440 is a wasteful number, since it uses less digits than its factorization.

655995912440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773 (or 7769 counting only the distinct ones).

The product of its (nonzero) digits is 17496000, while the sum is 59.

The spelling of 655995912440 in words is "six hundred fifty-five billion, nine hundred ninety-five million, nine hundred twelve thousand, four hundred forty".