78777140723 has 2 divisors, whose sum is σ = 78777140724. Its totient is φ = 78777140722.

The previous prime is 78777140713. The next prime is 78777140737. The reversal of 78777140723 is 32704177787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78777140723 - 2¹⁴ = 78777124339 is a prime.

It is not a weakly prime, because it can be changed into another prime (78777140713) 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, 39388570361 + 39388570362.

It is an arithmetic number, because the mean of its divisors is an integer number (39388570362).

Almost surely, 2^78777140723 is an apocalyptic number.

78777140723 is a deficient number, since it is larger than the sum of its proper divisors (1).

78777140723 is an equidigital number, since it uses as much as digits as its factorization.

78777140723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3226944, while the sum is 53.

The spelling of 78777140723 in words is "seventy-eight billion, seven hundred seventy-seven million, one hundred forty thousand, seven hundred twenty-three".