661041110 has 32 divisors (see below), whose sum is σ = 1202160960. Its totient is φ = 261700992.

The previous prime is 661041097. The next prime is 661041119. The reversal of 661041110 is 11140166.

It is a super-2 number, since 2×661041110² = 873950698220064200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661041119) 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, 461876 + ... + 463304.

It is an arithmetic number, because the mean of its divisors is an integer number (37567530).

Almost surely, 2^661041110 is an apocalyptic number.

661041110 is a deficient number, since it is larger than the sum of its proper divisors (541119850).

661041110 is a wasteful number, since it uses less digits than its factorization.

661041110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 661041110 is about 25710.7197487741. The cubic root of 661041110 is about 871.1163324225.

Adding to 661041110 its reverse (11140166), we get a palindrome (672181276).

The spelling of 661041110 in words is "six hundred sixty-one million, forty-one thousand, one hundred ten".