79863793787865 has 16 divisors (see below), whose sum is σ = 127782545256000. Its totient is φ = 42593864955072.

The previous prime is 79863793787783. The next prime is 79863793787873. The reversal of 79863793787865 is 56878739736897.

It is a happy number.

It is not a de Polignac number, because 79863793787865 - 2¹¹ = 79863793785817 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5673690 + ... + 13853459.

It is an arithmetic number, because the mean of its divisors is an integer number (7986409078500).

Almost surely, 2^{79863793787865} is an apocalyptic number.

It is an amenable number.

79863793787865 is a deficient number, since it is larger than the sum of its proper divisors (47918751468135).

79863793787865 is a wasteful number, since it uses less digits than its factorization.

79863793787865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19799816.

The product of its digits is 161310320640, while the sum is 93.

The spelling of 79863793787865 in words is "seventy-nine trillion, eight hundred sixty-three billion, seven hundred ninety-three million, seven hundred eighty-seven thousand, eight hundred sixty-five".