20166661461742 has 4 divisors (see below), whose sum is σ = 30249992192616. Its totient is φ = 10083330730870.

The previous prime is 20166661461719. The next prime is 20166661461743. The reversal of 20166661461742 is 24716416666102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20166661461742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166661461743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5041665365434 + ... + 5041665365437.

It is an arithmetic number, because the mean of its divisors is an integer number (7562498048154).

Almost surely, 2^{20166661461742} is an apocalyptic number.

20166661461742 is a deficient number, since it is larger than the sum of its proper divisors (10083330730874).

20166661461742 is a wasteful number, since it uses less digits than its factorization.

20166661461742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10083330730873.

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 20166661461742 in words is "twenty trillion, one hundred sixty-six billion, six hundred sixty-one million, four hundred sixty-one thousand, seven hundred forty-two".