20166661021610 has 16 divisors (see below), whose sum is σ = 37470957253632. Its totient is φ = 7806449427600.

The previous prime is 20166661021601. The next prime is 20166661021627. The reversal of 20166661021610 is 1612016666102.

It is a happy 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, 32526872306 + ... + 32526872925.

It is an arithmetic number, because the mean of its divisors is an integer number (2341934828352).

Almost surely, 2^{20166661021610} is an apocalyptic number.

20166661021610 is a deficient number, since it is larger than the sum of its proper divisors (17304296232022).

20166661021610 is a wasteful number, since it uses less digits than its factorization.

20166661021610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65053745269.

The product of its (nonzero) digits is 31104, while the sum is 38.

Adding to 20166661021610 its reverse (1612016666102), we get a palindrome (21778677687712).

The spelling of 20166661021610 in words is "twenty trillion, one hundred sixty-six billion, six hundred sixty-one million, twenty-one thousand, six hundred ten".