78108444677 has 2 divisors, whose sum is σ = 78108444678. Its totient is φ = 78108444676.

The previous prime is 78108444587. The next prime is 78108444683. The reversal of 78108444677 is 77644480187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48294897121 + 29813547556 = 219761^2 + 172666^2 .

It is a cyclic number.

It is not a de Polignac number, because 78108444677 - 2¹⁸ = 78108182533 is a prime.

It is a super-2 number, since 2×78108444677² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78108444277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39054222338 + 39054222339.

It is an arithmetic number, because the mean of its divisors is an integer number (39054222339).

Almost surely, 2^78108444677 is an apocalyptic number.

It is an amenable number.

78108444677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78108444677 is an equidigital number, since it uses as much as digits as its factorization.

78108444677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8429568, while the sum is 56.

The spelling of 78108444677 in words is "seventy-eight billion, one hundred eight million, four hundred forty-four thousand, six hundred seventy-seven".