19905767795 has 8 divisors (see below), whose sum is σ = 24925483296. Its totient is φ = 15232239616.

The previous prime is 19905767779. The next prime is 19905767801. The reversal of 19905767795 is 59776750991.

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

It is a cyclic number.

It is not a de Polignac number, because 19905767795 - 2⁴ = 19905767779 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86546702 + ... + 86546931.

It is an arithmetic number, because the mean of its divisors is an integer number (3115685412).

Almost surely, 2^19905767795 is an apocalyptic number.

19905767795 is a deficient number, since it is larger than the sum of its proper divisors (5019715501).

19905767795 is a wasteful number, since it uses less digits than its factorization.

19905767795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173093661.

The product of its (nonzero) digits is 37507050, while the sum is 65.

The spelling of 19905767795 in words is "nineteen billion, nine hundred five million, seven hundred sixty-seven thousand, seven hundred ninety-five".