78841549979 has 4 divisors (see below), whose sum is σ = 78861528984. Its totient is φ = 78821570976.

The previous prime is 78841549939. The next prime is 78841549987. The reversal of 78841549979 is 97994514887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97994514887 = 29 ⋅3379121203.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78841549979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78841549939) 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, 9983582 + ... + 9991475.

It is an arithmetic number, because the mean of its divisors is an integer number (19715382246).

Almost surely, 2^78841549979 is an apocalyptic number.

78841549979 is a deficient number, since it is larger than the sum of its proper divisors (19979005).

78841549979 is a wasteful number, since it uses less digits than its factorization.

78841549979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19979004.

The product of its digits is 182891520, while the sum is 71.

The spelling of 78841549979 in words is "seventy-eight billion, eight hundred forty-one million, five hundred forty-nine thousand, nine hundred seventy-nine".