655171980 has 96 divisors (see below), whose sum is σ = 1906157568. Its totient is φ = 167961600.

The previous prime is 655171969. The next prime is 655171981. The reversal of 655171980 is 89171556.

It is not an unprimeable number, because it can be changed into a prime (655171981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302100 + ... + 304260.

It is an arithmetic number, because the mean of its divisors is an integer number (19855808).

Almost surely, 2^655171980 is an apocalyptic number.

655171980 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 655171980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953078784).

655171980 is an abundant number, since it is smaller than the sum of its proper divisors (1250985588).

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

655171980 is a wasteful number, since it uses less digits than its factorization.

655171980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367 (or 2365 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 42.

The square root of 655171980 is about 25596.3274709479. The cubic root of 655171980 is about 868.5305621777.

The spelling of 655171980 in words is "six hundred fifty-five million, one hundred seventy-one thousand, nine hundred eighty".