78801717819 has 16 divisors (see below), whose sum is σ = 114626150784. Its totient is φ = 47756337600.

The previous prime is 78801717791. The next prime is 78801717829. The reversal of 78801717819 is 91871710887.

It is not a de Polignac number, because 78801717819 - 2¹⁶ = 78801652283 is a prime.

It is a super-2 number, since 2×78801717819² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78801717829) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 870064 + ... + 956354.

It is an arithmetic number, because the mean of its divisors is an integer number (7164134424).

Almost surely, 2^78801717819 is an apocalyptic number.

78801717819 is a deficient number, since it is larger than the sum of its proper divisors (35824432965).

78801717819 is a wasteful number, since it uses less digits than its factorization.

78801717819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113978.

The product of its (nonzero) digits is 1580544, while the sum is 57.

The spelling of 78801717819 in words is "seventy-eight billion, eight hundred one million, seven hundred seventeen thousand, eight hundred nineteen".