655855680 has 224 divisors, whose sum is σ = 2247960960. Its totient is φ = 161464320.

The previous prime is 655855679. The next prime is 655855691. The reversal of 655855680 is 86558556.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 747402 + ... + 748278.

It is an arithmetic number, because the mean of its divisors is an integer number (10035540).

Almost surely, 2^655855680 is an apocalyptic number.

655855680 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 655855680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123980480).

655855680 is an abundant number, since it is smaller than the sum of its proper divisors (1592105280).

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

655855680 is a wasteful number, since it uses less digits than its factorization.

655855680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 947 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 48.

The square root of 655855680 is about 25609.6794200943. The cubic root of 655855680 is about 868.8325734186.

The spelling of 655855680 in words is "six hundred fifty-five million, eight hundred fifty-five thousand, six hundred eighty".