78500434111 has 16 divisors (see below), whose sum is σ = 86501196288. Its totient is φ = 70644261600.

The previous prime is 78500434097. The next prime is 78500434123. The reversal of 78500434111 is 11143400587.

It is a de Polignac number, because none of the positive numbers 2^k-78500434111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78500434171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3338566 + ... + 3361996.

It is an arithmetic number, because the mean of its divisors is an integer number (5406324768).

Almost surely, 2^78500434111 is an apocalyptic number.

78500434111 is a deficient number, since it is larger than the sum of its proper divisors (8000762177).

78500434111 is a wasteful number, since it uses less digits than its factorization.

78500434111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26502.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 78500434111 its reverse (11143400587), we get a palindrome (89643834698).

The spelling of 78500434111 in words is "seventy-eight billion, five hundred million, four hundred thirty-four thousand, one hundred eleven".