78803636005 has 4 divisors (see below), whose sum is σ = 94564363212. Its totient is φ = 63042908800.

The previous prime is 78803636003. The next prime is 78803636047. The reversal of 78803636005 is 50063630887.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42178479876 + 36625156129 = 205374^2 + 191377^2 .

It is not a de Polignac number, because 78803636005 - 2¹ = 78803636003 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 (78803636003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880363596 + ... + 7880363605.

It is an arithmetic number, because the mean of its divisors is an integer number (23641090803).

Almost surely, 2^78803636005 is an apocalyptic number.

It is an amenable number.

78803636005 is a deficient number, since it is larger than the sum of its proper divisors (15760727207).

78803636005 is a wasteful number, since it uses less digits than its factorization.

78803636005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15760727206.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 78803636005 in words is "seventy-eight billion, eight hundred three million, six hundred thirty-six thousand, five".