78400555505005 has 16 divisors (see below), whose sum is σ = 94583174865984. Its totient is φ = 62386231815040.

The previous prime is 78400555504991. The next prime is 78400555505023. The reversal of 78400555505005 is 50050555500487.

It is not a de Polignac number, because 78400555505005 - 2¹⁵ = 78400555472237 is a prime.

It is a super-2 number, since 2×78400555505005² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78400555505005.

It is a congruent number.

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, 48765919 + ... + 50347948.

It is an arithmetic number, because the mean of its divisors is an integer number (5911448429124).

Almost surely, 2^{78400555505005} is an apocalyptic number.

It is an amenable number.

78400555505005 is a deficient number, since it is larger than the sum of its proper divisors (16182619360979).

78400555505005 is a wasteful number, since it uses less digits than its factorization.

78400555505005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99114716.

The product of its (nonzero) digits is 3500000, while the sum is 49.

The spelling of 78400555505005 in words is "seventy-eight trillion, four hundred billion, five hundred fifty-five million, five hundred five thousand, five".