77745839071 has 4 divisors (see below), whose sum is σ = 77766126192. Its totient is φ = 77725551952.

The previous prime is 77745839053. The next prime is 77745839081. The reversal of 77745839071 is 17093854777.

It is a happy number.

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 77745839071 - 2³³ = 69155904479 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77745838997 and 77745839015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77745839051) 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, 10137811 + ... + 10145476.

It is an arithmetic number, because the mean of its divisors is an integer number (19441531548).

Almost surely, 2^77745839071 is an apocalyptic number.

77745839071 is a deficient number, since it is larger than the sum of its proper divisors (20287121).

77745839071 is a wasteful number, since it uses less digits than its factorization.

77745839071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20287120.

The product of its (nonzero) digits is 10372320, while the sum is 58.

The spelling of 77745839071 in words is "seventy-seven billion, seven hundred forty-five million, eight hundred thirty-nine thousand, seventy-one".