78953345209 has 4 divisors (see below), whose sum is σ = 79904590416. Its totient is φ = 78002100004.

The previous prime is 78953345173. The next prime is 78953345257. The reversal of 78953345209 is 90254335987.

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 a cyclic number.

It is not a de Polignac number, because 78953345209 - 2²⁵ = 78919790777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78953345209.

It is not an unprimeable number, because it can be changed into a prime (78953340209) 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, 475622479 + ... + 475622644.

It is an arithmetic number, because the mean of its divisors is an integer number (19976147604).

Almost surely, 2^78953345209 is an apocalyptic number.

It is an amenable number.

78953345209 is a deficient number, since it is larger than the sum of its proper divisors (951245207).

78953345209 is an equidigital number, since it uses as much as digits as its factorization.

78953345209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951245206.

The product of its (nonzero) digits is 8164800, while the sum is 55.

The spelling of 78953345209 in words is "seventy-eight billion, nine hundred fifty-three million, three hundred forty-five thousand, two hundred nine".