210556661105 has 16 divisors (see below), whose sum is σ = 288894366720. Its totient is φ = 144316237632.

The previous prime is 210556661093. The next prime is 210556661149. The reversal of 210556661105 is 501166655012.

It is a happy number.

It is not a de Polignac number, because 210556661105 - 2¹² = 210556657009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285670 + ... + 1440159.

It is an arithmetic number, because the mean of its divisors is an integer number (18055897920).

Almost surely, 2^210556661105 is an apocalyptic number.

It is an amenable number.

210556661105 is a deficient number, since it is larger than the sum of its proper divisors (78337705615).

210556661105 is a wasteful number, since it uses less digits than its factorization.

210556661105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728048.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 210556661105 in words is "two hundred ten billion, five hundred fifty-six million, six hundred sixty-one thousand, one hundred five".