78157384205 has 4 divisors (see below), whose sum is σ = 93788861052. Its totient is φ = 62525907360.

The previous prime is 78157384153. The next prime is 78157384219. The reversal of 78157384205 is 50248375187.

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 54313700809 + 23843683396 = 233053^2 + 154414^2 .

It is not a de Polignac number, because 78157384205 - 2⁶ = 78157384141 is a prime.

It is a super-2 number, since 2×78157384205² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7815738416 + ... + 7815738425.

It is an arithmetic number, because the mean of its divisors is an integer number (23447215263).

Almost surely, 2^78157384205 is an apocalyptic number.

It is an amenable number.

78157384205 is a deficient number, since it is larger than the sum of its proper divisors (15631476847).

78157384205 is a wasteful number, since it uses less digits than its factorization.

78157384205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15631476846.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 78157384205 in words is "seventy-eight billion, one hundred fifty-seven million, three hundred eighty-four thousand, two hundred five".