77878741286347 has 4 divisors (see below), whose sum is σ = 77963484204880. Its totient is φ = 77793998367816.

The previous prime is 77878741286329. The next prime is 77878741286459. The reversal of 77878741286347 is 74368214787877.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77878741286347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77878741226347) 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, 42371457888 + ... + 42371459725.

It is an arithmetic number, because the mean of its divisors is an integer number (19490871051220).

Almost surely, 2^{77878741286347} is an apocalyptic number.

77878741286347 is a deficient number, since it is larger than the sum of its proper divisors (84742918533).

77878741286347 is an equidigital number, since it uses as much as digits as its factorization.

77878741286347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84742918532.

The product of its digits is 4956585984, while the sum is 79.

The spelling of 77878741286347 in words is "seventy-seven trillion, eight hundred seventy-eight billion, seven hundred forty-one million, two hundred eighty-six thousand, three hundred forty-seven".