655166880 has 336 divisors, whose sum is σ = 2394640584. Its totient is φ = 169205760.

The previous prime is 655166879. The next prime is 655166903. The reversal of 655166880 is 88661556.

It can be written as a sum of positive squares in 4 ways, for example, as 382124304 + 273042576 = 19548^2 + 16524^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 4782172 + ... + 4782308.

Almost surely, 2^655166880 is an apocalyptic number.

655166880 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 655166880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197320292).

655166880 is an abundant number, since it is smaller than the sum of its proper divisors (1739473704).

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

655166880 is a wasteful number, since it uses less digits than its factorization.

655166880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 655166880 is about 25596.2278470872. The cubic root of 655166880 is about 868.5283085621.

The spelling of 655166880 in words is "six hundred fifty-five million, one hundred sixty-six thousand, eight hundred eighty".