561100661102 has 16 divisors (see below), whose sum is σ = 850370058720. Its totient is φ = 277647485952.

The previous prime is 561100660993. The next prime is 561100661141. The reversal of 561100661102 is 201166001165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557027 + ... + 1196862.

It is an arithmetic number, because the mean of its divisors is an integer number (53148128670).

Almost surely, 2^561100661102 is an apocalyptic number.

561100661102 is a deficient number, since it is larger than the sum of its proper divisors (289269397618).

561100661102 is a wasteful number, since it uses less digits than its factorization.

561100661102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755547.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 561100661102 its reverse (201166001165), we get a palindrome (762266662267).

The spelling of 561100661102 in words is "five hundred sixty-one billion, one hundred million, six hundred sixty-one thousand, one hundred two".