78043164861 has 4 divisors (see below), whose sum is σ = 104057553152. Its totient is φ = 52028776572.

The previous prime is 78043164853. The next prime is 78043164883. The reversal of 78043164861 is 16846134087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78043164861 - 2³ = 78043164853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78043164861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78043164821) 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 3 ways as a sum of consecutive naturals, for example, 13007194141 + ... + 13007194146.

It is an arithmetic number, because the mean of its divisors is an integer number (26014388288).

Almost surely, 2^78043164861 is an apocalyptic number.

It is an amenable number.

78043164861 is a deficient number, since it is larger than the sum of its proper divisors (26014388291).

78043164861 is a wasteful number, since it uses less digits than its factorization.

78043164861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26014388290.

The product of its (nonzero) digits is 774144, while the sum is 48.

The spelling of 78043164861 in words is "seventy-eight billion, forty-three million, one hundred sixty-four thousand, eight hundred sixty-one".