78565875723 has 18 divisors (see below), whose sum is σ = 117693700852. Its totient is φ = 52374337560.

The previous prime is 78565875721. The next prime is 78565875757. The reversal of 78565875723 is 32757856587.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

78565875723 is a `hidden beast` number, since 7 + 8 + 5 + 6 + 58 + 7 + 572 + 3 = 666.

It is not a de Polignac number, because 78565875723 - 2¹ = 78565875721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78565875721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4360393 + ... + 4378373.

Almost surely, 2^78565875723 is an apocalyptic number.

78565875723 is a deficient number, since it is larger than the sum of its proper divisors (39127825129).

78565875723 is an frugal number, since it uses more digits than its factorization.

78565875723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35977 (or 17984 counting only the distinct ones).

The product of its digits is 98784000, while the sum is 63.

The spelling of 78565875723 in words is "seventy-eight billion, five hundred sixty-five million, eight hundred seventy-five thousand, seven hundred twenty-three".