655125680 has 80 divisors (see below), whose sum is σ = 1671321600. Its totient is φ = 236839680.

The previous prime is 655125659. The next prime is 655125703. The reversal of 655125680 is 86521556.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155441 + ... + 159599.

It is an arithmetic number, because the mean of its divisors is an integer number (20891520).

Almost surely, 2^655125680 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 655125680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835660800).

655125680 is an abundant number, since it is smaller than the sum of its proper divisors (1016195920).

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

655125680 is a wasteful number, since it uses less digits than its factorization.

655125680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4362 (or 4356 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 655125680 is about 25595.4230283463. The cubic root of 655125680 is about 868.5101024544.

The spelling of 655125680 in words is "six hundred fifty-five million, one hundred twenty-five thousand, six hundred eighty".