661022200 has 24 divisors (see below), whose sum is σ = 1536877080. Its totient is φ = 264408800.

The previous prime is 661022191. The next prime is 661022221. The reversal of 661022200 is 2220166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1652356 + ... + 1652755.

It is an arithmetic number, because the mean of its divisors is an integer number (64036545).

Almost surely, 2^661022200 is an apocalyptic number.

It is an amenable number.

661022200 is an abundant number, since it is smaller than the sum of its proper divisors (875854880).

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

661022200 is a wasteful number, since it uses less digits than its factorization.

661022200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305127 (or 3305118 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 661022200 is about 25710.3520007020. The cubic root of 661022200 is about 871.1080258454.

Adding to 661022200 its reverse (2220166), we get a palindrome (663242366).

The spelling of 661022200 in words is "six hundred sixty-one million, twenty-two thousand, two hundred".