77857575355081 has 2 divisors, whose sum is σ = 77857575355082. Its totient is φ = 77857575355080.

The previous prime is 77857575355033. The next prime is 77857575355129. The reversal of 77857575355081 is 18055357575877.

It is a balanced prime because it is at equal distance from previous prime (77857575355033) and next prime (77857575355129).

It can be written as a sum of positive squares in only one way, i.e., 74819732025600 + 3037843329481 = 8649840^2 + 1742941^2 .

It is a cyclic number.

It is not a de Polignac number, because 77857575355081 - 2¹⁹ = 77857574830793 is a prime.

It is a super-2 number, since 2×77857575355081² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77857575354995 and 77857575355013.

It is not a weakly prime, because it can be changed into another prime (77857575356081) 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, 38928787677540 + 38928787677541.

It is an arithmetic number, because the mean of its divisors is an integer number (38928787677541).

Almost surely, 2^{77857575355081} is an apocalyptic number.

It is an amenable number.

77857575355081 is a deficient number, since it is larger than the sum of its proper divisors (1).

77857575355081 is an equidigital number, since it uses as much as digits as its factorization.

77857575355081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440600000, while the sum is 73.

The spelling of 77857575355081 in words is "seventy-seven trillion, eight hundred fifty-seven billion, five hundred seventy-five million, three hundred fifty-five thousand, eighty-one".