775138022123 has 4 divisors (see below), whose sum is σ = 776415021120. Its totient is φ = 773861023128.

The previous prime is 775138022107. The next prime is 775138022143. The reversal of 775138022123 is 321220831577.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321220831577 = 176329 ⋅1821713.

It is a cyclic number.

It is not a de Polignac number, because 775138022123 - 2⁴ = 775138022107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775138022143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638498588 + ... + 638499801.

It is an arithmetic number, because the mean of its divisors is an integer number (194103755280).

Almost surely, 2^775138022123 is an apocalyptic number.

775138022123 is a deficient number, since it is larger than the sum of its proper divisors (1276998997).

775138022123 is a wasteful number, since it uses less digits than its factorization.

775138022123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276998996.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 775138022123 in words is "seven hundred seventy-five billion, one hundred thirty-eight million, twenty-two thousand, one hundred twenty-three".