78355500005 has 4 divisors (see below), whose sum is σ = 94026600012. Its totient is φ = 62684400000.

The previous prime is 78355499993. The next prime is 78355500019. The reversal of 78355500005 is 50000555387.

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 27257349604 + 51098150401 = 165098^2 + 226049^2 .

It is not a de Polignac number, because 78355500005 - 2¹² = 78355495909 is a prime.

It is a super-2 number, since 2×78355500005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 7835549996 + ... + 7835550005.

It is an arithmetic number, because the mean of its divisors is an integer number (23506650003).

Almost surely, 2^78355500005 is an apocalyptic number.

It is an amenable number.

78355500005 is a deficient number, since it is larger than the sum of its proper divisors (15671100007).

78355500005 is a wasteful number, since it uses less digits than its factorization.

78355500005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15671100006.

The product of its (nonzero) digits is 105000, while the sum is 38.

The spelling of 78355500005 in words is "seventy-eight billion, three hundred fifty-five million, five hundred thousand, five".