655102100 has 72 divisors (see below), whose sum is σ = 1519777728. Its totient is φ = 244499200.

The previous prime is 655102093. The next prime is 655102109. The reversal of 655102100 is 1201556.

It is a super-2 number, since 2×655102100² = 858317522848820000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655102109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90827 + ... + 97773.

It is an arithmetic number, because the mean of its divisors is an integer number (21108024).

Almost surely, 2^655102100 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 655102100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759888864).

655102100 is an abundant number, since it is smaller than the sum of its proper divisors (864675628).

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

655102100 is a wasteful number, since it uses less digits than its factorization.

655102100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7025 (or 7018 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 655102100 is about 25594.9623949714. The cubic root of 655102100 is about 868.4996822075.

Adding to 655102100 its reverse (1201556), we get a palindrome (656303656).

The spelling of 655102100 in words is "six hundred fifty-five million, one hundred two thousand, one hundred".