2116660661623 has 8 divisors (see below), whose sum is σ = 2231698554800. Its totient is φ = 2001986238528.

The previous prime is 2116660661579. The next prime is 2116660661629. The reversal of 2116660661623 is 3261660666112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2116660661623 is a prime.

It is a super-2 number, since 2×2116660661623² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116660661629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90855558 + ... + 90878851.

It is an arithmetic number, because the mean of its divisors is an integer number (278962319350).

Almost surely, 2^{2116660661623} is an apocalyptic number.

2116660661623 is a deficient number, since it is larger than the sum of its proper divisors (115037893177).

2116660661623 is a wasteful number, since it uses less digits than its factorization.

2116660661623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181735041.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 2116660661623 in words is "two trillion, one hundred sixteen billion, six hundred sixty million, six hundred sixty-one thousand, six hundred twenty-three".