78266711807 has 2 divisors, whose sum is σ = 78266711808. Its totient is φ = 78266711806.

The previous prime is 78266711797. The next prime is 78266711813. The reversal of 78266711807 is 70811766287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78266711807 - 2²⁴ = 78249934591 is a prime.

It is a super-2 number, since 2×78266711807² (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 (78266713807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39133355903 + 39133355904.

It is an arithmetic number, because the mean of its divisors is an integer number (39133355904).

Almost surely, 2^78266711807 is an apocalyptic number.

78266711807 is a deficient number, since it is larger than the sum of its proper divisors (1).

78266711807 is an equidigital number, since it uses as much as digits as its factorization.

78266711807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 53.

The spelling of 78266711807 in words is "seventy-eight billion, two hundred sixty-six million, seven hundred eleven thousand, eight hundred seven".