20117667660661 has 32 divisors (see below), whose sum is σ = 22503749909760. Its totient is φ = 17872497017856.

The previous prime is 20117667660619. The next prime is 20117667660691. The reversal of 20117667660661 is 16606676671102.

It is a cyclic number.

It is not a de Polignac number, because 20117667660661 - 2³¹ = 20115520177013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117667660691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470050515 + ... + 470093311.

It is an arithmetic number, because the mean of its divisors is an integer number (703242184680).

Almost surely, 2^{20117667660661} is an apocalyptic number.

It is an amenable number.

20117667660661 is a deficient number, since it is larger than the sum of its proper divisors (2386082249099).

20117667660661 is a wasteful number, since it uses less digits than its factorization.

20117667660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48093.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 20117667660661 in words is "twenty trillion, one hundred seventeen billion, six hundred sixty-seven million, six hundred sixty thousand, six hundred sixty-one".