78919253498919 has 16 divisors (see below), whose sum is σ = 105770582607872. Its totient is φ = 52340706132768.

The previous prime is 78919253498843. The next prime is 78919253498947. The reversal of 78919253498919 is 91989435291987.

It is a happy number.

It is not a de Polignac number, because 78919253498919 - 2²⁰ = 78919252450343 is a prime.

It is a super-2 number, since 2×78919253498919² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78919253493919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39794224 + ... + 41730309.

It is an arithmetic number, because the mean of its divisors is an integer number (6610661412992).

Almost surely, 2^{78919253498919} is an apocalyptic number.

78919253498919 is a deficient number, since it is larger than the sum of its proper divisors (26851329108953).

78919253498919 is a wasteful number, since it uses less digits than its factorization.

78919253498919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81526206.

The product of its digits is 3174474240, while the sum is 84.

The spelling of 78919253498919 in words is "seventy-eight trillion, nine hundred nineteen billion, two hundred fifty-three million, four hundred ninety-eight thousand, nine hundred nineteen".