77891886071 has 4 divisors (see below), whose sum is σ = 77967436944. Its totient is φ = 77816335200.

The previous prime is 77891886019. The next prime is 77891886077. The reversal of 77891886071 is 17068819877.

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

It is a cyclic number.

It is not a de Polignac number, because 77891886071 - 2¹⁴ = 77891869687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77891885995 and 77891886013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77891886077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37773890 + ... + 37775951.

It is an arithmetic number, because the mean of its divisors is an integer number (19491859236).

Almost surely, 2^77891886071 is an apocalyptic number.

77891886071 is a deficient number, since it is larger than the sum of its proper divisors (75550873).

77891886071 is a wasteful number, since it uses less digits than its factorization.

77891886071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75550872.

The product of its (nonzero) digits is 9483264, while the sum is 62.

The spelling of 77891886071 in words is "seventy-seven billion, eight hundred ninety-one million, eight hundred eighty-six thousand, seventy-one".