78842123169 has 16 divisors (see below), whose sum is σ = 108194549760. Its totient is φ = 51047655120.

The previous prime is 78842123159. The next prime is 78842123219. The reversal of 78842123169 is 96132124887.

It is a happy number.

It is not a de Polignac number, because 78842123169 - 2¹² = 78842119073 is a prime.

It is a super-2 number, since 2×78842123169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78842123149) 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 15 ways as a sum of consecutive naturals, for example, 2748049 + ... + 2776590.

It is an arithmetic number, because the mean of its divisors is an integer number (6762159360).

Almost surely, 2^78842123169 is an apocalyptic number.

It is an amenable number.

78842123169 is a deficient number, since it is larger than the sum of its proper divisors (29352426591).

78842123169 is a wasteful number, since it uses less digits than its factorization.

78842123169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5524780.

The product of its digits is 1161216, while the sum is 51.

The spelling of 78842123169 in words is "seventy-eight billion, eight hundred forty-two million, one hundred twenty-three thousand, one hundred sixty-nine".