77566678871 has 4 divisors (see below), whose sum is σ = 84618195144. Its totient is φ = 70515162600.

The previous prime is 77566678859. The next prime is 77566678883. The reversal of 77566678871 is 17887666577.

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

It is an interprime number because it is at equal distance from previous prime (77566678859) and next prime (77566678883).

It is a cyclic number.

It is not a de Polignac number, because 77566678871 - 2⁶ = 77566678807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77566678171) 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, 3525758120 + ... + 3525758141.

It is an arithmetic number, because the mean of its divisors is an integer number (21154548786).

Almost surely, 2^77566678871 is an apocalyptic number.

77566678871 is a deficient number, since it is larger than the sum of its proper divisors (7051516273).

77566678871 is a wasteful number, since it uses less digits than its factorization.

77566678871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7051516272.

The product of its digits is 165957120, while the sum is 68.

The spelling of 77566678871 in words is "seventy-seven billion, five hundred sixty-six million, six hundred seventy-eight thousand, eight hundred seventy-one".