776544885481 has 2 divisors, whose sum is σ = 776544885482. Its totient is φ = 776544885480.

The previous prime is 776544885409. The next prime is 776544885541. The reversal of 776544885481 is 184588445677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626655891456 + 149888994025 = 791616^2 + 387155^2 .

It is an emirp because it is prime and its reverse (184588445677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 776544885481 - 2¹⁷ = 776544754409 is a prime.

It is a super-2 number, since 2×776544885481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (776544885581) 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, 388272442740 + 388272442741.

It is an arithmetic number, because the mean of its divisors is an integer number (388272442741).

Almost surely, 2^776544885481 is an apocalyptic number.

It is an amenable number.

776544885481 is a deficient number, since it is larger than the sum of its proper divisors (1).

776544885481 is an equidigital number, since it uses as much as digits as its factorization.

776544885481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240844800, while the sum is 67.

The spelling of 776544885481 in words is "seven hundred seventy-six billion, five hundred forty-four million, eight hundred eighty-five thousand, four hundred eighty-one".