661320253300 has 54 divisors (see below), whose sum is σ = 1669361280342. Its totient is φ = 226738370880.

The previous prime is 661320253271. The next prime is 661320253361. The reversal of 661320253300 is 3352023166.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 23488014564 + 637832238736 = 153258^2 + 798644^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67476759 + ... + 67486558.

Almost surely, 2^661320253300 is an apocalyptic number.

It is an amenable number.

661320253300 is an abundant number, since it is smaller than the sum of its proper divisors (1008041027042).

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

661320253300 is a wasteful number, since it uses less digits than its factorization.

661320253300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134963345 (or 134963331 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 661320253300 its reverse (3352023166), we get a palindrome (664672276466).

The spelling of 661320253300 in words is "six hundred sixty-one billion, three hundred twenty million, two hundred fifty-three thousand, three hundred".