78717977827 has 2 divisors, whose sum is σ = 78717977828. Its totient is φ = 78717977826.

The previous prime is 78717977753. The next prime is 78717977831. The reversal of 78717977827 is 72877971787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78717977827 - 2³⁵ = 44358239459 is a prime.

It is a super-3 number, since 3×78717977827³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (78717977887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39358988913 + 39358988914.

It is an arithmetic number, because the mean of its divisors is an integer number (39358988914).

Almost surely, 2^78717977827 is an apocalyptic number.

78717977827 is a deficient number, since it is larger than the sum of its proper divisors (1).

78717977827 is an equidigital number, since it uses as much as digits as its factorization.

78717977827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135531648, while the sum is 70.

The spelling of 78717977827 in words is "seventy-eight billion, seven hundred seventeen million, nine hundred seventy-seven thousand, eight hundred twenty-seven".