78646458771385 has 8 divisors (see below), whose sum is σ = 94742971346376. Its totient is φ = 62672353136640.

The previous prime is 78646458771379. The next prime is 78646458771449. The reversal of 78646458771385 is 58317785464687.

It can be written as a sum of positive squares in 4 ways, for example, as 17256538501801 + 61389920269584 = 4154099^2 + 7835172^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78646458771385 - 2²⁹ = 78645921900473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30601733646 + ... + 30601736215.

It is an arithmetic number, because the mean of its divisors is an integer number (11842871418297).

Almost surely, 2^{78646458771385} is an apocalyptic number.

It is an amenable number.

78646458771385 is a deficient number, since it is larger than the sum of its proper divisors (16096512574991).

78646458771385 is a wasteful number, since it uses less digits than its factorization.

78646458771385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61203470123.

The product of its digits is 7586611200, while the sum is 79.

The spelling of 78646458771385 in words is "seventy-eight trillion, six hundred forty-six billion, four hundred fifty-eight million, seven hundred seventy-one thousand, three hundred eighty-five".