78026544077 has 2 divisors, whose sum is σ = 78026544078. Its totient is φ = 78026544076.

The previous prime is 78026544073. The next prime is 78026544107. The reversal of 78026544077 is 77044562087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48476590276 + 29549953801 = 220174^2 + 171901^2 .

It is a cyclic number.

It is not a de Polignac number, because 78026544077 - 2² = 78026544073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78026544073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39013272038 + 39013272039.

It is an arithmetic number, because the mean of its divisors is an integer number (39013272039).

Almost surely, 2^78026544077 is an apocalyptic number.

It is an amenable number.

78026544077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78026544077 is an equidigital number, since it uses as much as digits as its factorization.

78026544077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2634240, while the sum is 50.

The spelling of 78026544077 in words is "seventy-eight billion, twenty-six million, five hundred forty-four thousand, seventy-seven".