79778629123 has 4 divisors (see below), whose sum is σ = 83977504360. Its totient is φ = 75579753888.

The previous prime is 79778629121. The next prime is 79778629153. The reversal of 79778629123 is 32192687797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32192687797 = 11261 ⋅2858777.

It is a cyclic number.

It is not a de Polignac number, because 79778629123 - 2¹ = 79778629121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79778629121) 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, 2099437590 + ... + 2099437627.

It is an arithmetic number, because the mean of its divisors is an integer number (20994376090).

Almost surely, 2^79778629123 is an apocalyptic number.

79778629123 is a deficient number, since it is larger than the sum of its proper divisors (4198875237).

79778629123 is a wasteful number, since it uses less digits than its factorization.

79778629123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4198875236.

The product of its digits is 16003008, while the sum is 61.

The spelling of 79778629123 in words is "seventy-nine billion, seven hundred seventy-eight million, six hundred twenty-nine thousand, one hundred twenty-three".