78793651523 has 4 divisors (see below), whose sum is σ = 78816781920. Its totient is φ = 78770521128.

The previous prime is 78793651507. The next prime is 78793651553. The reversal of 78793651523 is 32515639787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32515639787 = 23 ⋅1413723469.

It is a cyclic number.

It is not a de Polignac number, because 78793651523 - 2⁴ = 78793651507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78793651553) 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, 11560088 + ... + 11566901.

It is an arithmetic number, because the mean of its divisors is an integer number (19704195480).

Almost surely, 2^78793651523 is an apocalyptic number.

78793651523 is a deficient number, since it is larger than the sum of its proper divisors (23130397).

78793651523 is a wasteful number, since it uses less digits than its factorization.

78793651523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23130396.

The product of its digits is 9525600, while the sum is 56.

The spelling of 78793651523 in words is "seventy-eight billion, seven hundred ninety-three million, six hundred fifty-one thousand, five hundred twenty-three".