78825447443813 has 4 divisors (see below), whose sum is σ = 90086225650080. Its totient is φ = 67564669237548.

The previous prime is 78825447443807. The next prime is 78825447443837. The reversal of 78825447443813 is 31834474452887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78825447443813 - 2⁶ = 78825447443749 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 (78825447443713) 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, 5630389103123 + ... + 5630389103136.

It is an arithmetic number, because the mean of its divisors is an integer number (22521556412520).

Almost surely, 2^{78825447443813} is an apocalyptic number.

It is an amenable number.

78825447443813 is a deficient number, since it is larger than the sum of its proper divisors (11260778206267).

78825447443813 is a wasteful number, since it uses less digits than its factorization.

78825447443813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11260778206266.

The product of its digits is 578027520, while the sum is 68.

The spelling of 78825447443813 in words is "seventy-eight trillion, eight hundred twenty-five billion, four hundred forty-seven million, four hundred forty-three thousand, eight hundred thirteen".