123819699578409 has 6 divisors (see below), whose sum is σ = 178850677168826. Its totient is φ = 82546466385600.

The previous prime is 123819699578299. The next prime is 123819699578459. The reversal of 123819699578409 is 904875996918321.

123819699578409 is a `hidden beast` number, since 1 + 2 + 3 + 81 + 9 + 69 + 9 + 5 + 78 + 409 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120009286265625 + 3810413312784 = 10954875^2 + 1952028^2 .

It is a de Polignac number, because none of the positive numbers 2^k-123819699578409 is a prime.

It is a super-3 number, since 3×123819699578409³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123819699578459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6878872198792 + ... + 6878872198809.

It is a 1-persistent number, because it is pandigital, but 2⋅123819699578409 = 247639399156818 is not.

Almost surely, 2^{123819699578409} is an apocalyptic number.

It is an amenable number.

123819699578409 is a deficient number, since it is larger than the sum of its proper divisors (55030977590417).

123819699578409 is a wasteful number, since it uses less digits than its factorization.

123819699578409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13757744397607 (or 13757744397604 counting only the distinct ones).

The product of its (nonzero) digits is 2116316160, while the sum is 81.

The spelling of 123819699578409 in words is "one hundred twenty-three trillion, eight hundred nineteen billion, six hundred ninety-nine million, five hundred seventy-eight thousand, four hundred nine".