20195455865565 has 8 divisors (see below), whose sum is σ = 32312729384928. Its totient is φ = 10770909794960.

The previous prime is 20195455865491. The next prime is 20195455865587. The reversal of 20195455865565 is 56556855459102.

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

It is not a de Polignac number, because 20195455865565 - 2⁷ = 20195455865437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20195455865496 and 20195455865505.

It is a congruent 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, 673181862171 + ... + 673181862200.

It is an arithmetic number, because the mean of its divisors is an integer number (4039091173116).

Almost surely, 2^{20195455865565} is an apocalyptic number.

It is an amenable number.

20195455865565 is a deficient number, since it is larger than the sum of its proper divisors (12117273519363).

20195455865565 is a wasteful number, since it uses less digits than its factorization.

20195455865565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346363724379.

The product of its (nonzero) digits is 324000000, while the sum is 66.

The spelling of 20195455865565 in words is "twenty trillion, one hundred ninety-five billion, four hundred fifty-five million, eight hundred sixty-five thousand, five hundred sixty-five".