78104439653 has 4 divisors (see below), whose sum is σ = 80009426028. Its totient is φ = 76199453280.

The previous prime is 78104439649. The next prime is 78104439659. The reversal of 78104439653 is 35693440187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35693440187 = 181 ⋅197201327.

It can be written as a sum of positive squares in 2 ways, for example, as 35875011649 + 42229428004 = 189407^2 + 205498^2 .

It is a cyclic number.

It is not a de Polignac number, because 78104439653 - 2² = 78104439649 is a prime.

It is a super-2 number, since 2×78104439653² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78104439659) 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, 952493126 + ... + 952493207.

It is an arithmetic number, because the mean of its divisors is an integer number (20002356507).

Almost surely, 2^78104439653 is an apocalyptic number.

It is an amenable number.

78104439653 is a deficient number, since it is larger than the sum of its proper divisors (1904986375).

78104439653 is a wasteful number, since it uses less digits than its factorization.

78104439653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904986374.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 78104439653 in words is "seventy-eight billion, one hundred four million, four hundred thirty-nine thousand, six hundred fifty-three".