661803281110 has 32 divisors (see below), whose sum is σ = 1195550308512. Its totient is φ = 263765141760.

The previous prime is 661803281071. The next prime is 661803281119. The reversal of 661803281110 is 11182308166.

It is a self number, because there is not a number n which added to its sum of digits gives 661803281110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661803281119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16789725 + ... + 16829095.

It is an arithmetic number, because the mean of its divisors is an integer number (37360947141).

Almost surely, 2^661803281110 is an apocalyptic number.

661803281110 is a deficient number, since it is larger than the sum of its proper divisors (533747027402).

661803281110 is a wasteful number, since it uses less digits than its factorization.

661803281110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45408.

The product of its (nonzero) digits is 13824, while the sum is 37.

Adding to 661803281110 its reverse (11182308166), we get a palindrome (672985589276).

The spelling of 661803281110 in words is "six hundred sixty-one billion, eight hundred three million, two hundred eighty-one thousand, one hundred ten".