655399792320 has 1344 divisors, whose sum is σ = 2766251658240. Its totient is φ = 128265486336.

The previous prime is 655399792277. The next prime is 655399792339. The reversal of 655399792320 is 23297993556.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 1602444276 + ... + 1602444684.

It is an arithmetic number, because the mean of its divisors is an integer number (2058222960).

Almost surely, 2^655399792320 is an apocalyptic number.

655399792320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655399792320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1383125829120).

655399792320 is an abundant number, since it is smaller than the sum of its proper divisors (2110851865920).

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

655399792320 is a wasteful number, since it uses less digits than its factorization.

655399792320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 60.

The spelling of 655399792320 in words is "six hundred fifty-five billion, three hundred ninety-nine million, seven hundred ninety-two thousand, three hundred twenty".