77874787871 has 4 divisors (see below), whose sum is σ = 77901840000. Its totient is φ = 77847735744.

The previous prime is 77874787853. The next prime is 77874787873. The reversal of 77874787871 is 17878747877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17878747877 = 47 ⋅380398891.

It is a cyclic number.

It is not a de Polignac number, because 77874787871 - 2²⁶ = 77807679007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77874787795 and 77874787804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77874787873) 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 3 ways as a sum of consecutive naturals, for example, 13521746 + ... + 13527503.

It is an arithmetic number, because the mean of its divisors is an integer number (19475460000).

Almost surely, 2^77874787871 is an apocalyptic number.

77874787871 is a deficient number, since it is larger than the sum of its proper divisors (27052129).

77874787871 is a wasteful number, since it uses less digits than its factorization.

77874787871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27052128.

The product of its digits is 240945152, while the sum is 71.

The spelling of 77874787871 in words is "seventy-seven billion, eight hundred seventy-four million, seven hundred eighty-seven thousand, eight hundred seventy-one".