78605773819 has 4 divisors (see below), whose sum is σ = 78611398920. Its totient is φ = 78600148720.

The previous prime is 78605773817. The next prime is 78605773849. The reversal of 78605773819 is 91837750687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91837750687 = 11783 ⋅7794089.

It is a cyclic number.

It is not a de Polignac number, because 78605773819 - 2¹ = 78605773817 is a prime.

It is a super-2 number, since 2×78605773819² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78605773817) 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, 2791537 + ... + 2819554.

It is an arithmetic number, because the mean of its divisors is an integer number (19652849730).

Almost surely, 2^78605773819 is an apocalyptic number.

78605773819 is a deficient number, since it is larger than the sum of its proper divisors (5625101).

78605773819 is a wasteful number, since it uses less digits than its factorization.

78605773819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625100.

The product of its (nonzero) digits is 17781120, while the sum is 61.

The spelling of 78605773819 in words is "seventy-eight billion, six hundred five million, seven hundred seventy-three thousand, eight hundred nineteen".