661226600 has 48 divisors (see below), whose sum is σ = 1618274400. Its totient is φ = 250568640.

The previous prime is 661226567. The next prime is 661226617. The reversal of 661226600 is 6622166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83204 + ... + 90803.

It is an arithmetic number, because the mean of its divisors is an integer number (33714050).

Almost surely, 2^661226600 is an apocalyptic number.

It is an amenable number.

661226600 is an abundant number, since it is smaller than the sum of its proper divisors (957047800).

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

661226600 is a wasteful number, since it uses less digits than its factorization.

661226600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174042 (or 174033 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 661226600 is about 25714.3267459990. The cubic root of 661226600 is about 871.1978040359.

Adding to 661226600 its reverse (6622166), we get a palindrome (667848766).

The spelling of 661226600 in words is "six hundred sixty-one million, two hundred twenty-six thousand, six hundred".