77278475898779 has 2 divisors, whose sum is σ = 77278475898780. Its totient is φ = 77278475898778.

The previous prime is 77278475898727. The next prime is 77278475898853. The reversal of 77278475898779 is 97789857487277.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77278475898779 is a prime.

It is a super-3 number, since 3×77278475898779³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77278475898691 and 77278475898700.

It is not a weakly prime, because it can be changed into another prime (77278475898709) 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, 38639237949389 + 38639237949390.

It is an arithmetic number, because the mean of its divisors is an integer number (38639237949390).

Almost surely, 2^{77278475898779} is an apocalyptic number.

77278475898779 is a deficient number, since it is larger than the sum of its proper divisors (1).

77278475898779 is an equidigital number, since it uses as much as digits as its factorization.

77278475898779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 195165573120, while the sum is 95.

The spelling of 77278475898779 in words is "seventy-seven trillion, two hundred seventy-eight billion, four hundred seventy-five million, eight hundred ninety-eight thousand, seven hundred seventy-nine".