77085533859181 has 2 divisors, whose sum is σ = 77085533859182. Its totient is φ = 77085533859180.

The previous prime is 77085533859161. The next prime is 77085533859199. The reversal of 77085533859181 is 18195833558077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75479015633956 + 1606518225225 = 8687866^2 + 1267485^2 .

It is a cyclic number.

It is not a de Polignac number, because 77085533859181 - 2³⁷ = 76948094905709 is a prime.

It is a super-2 number, since 2×77085533859181² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77085533859181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77085533859161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38542766929590 + 38542766929591.

It is an arithmetic number, because the mean of its divisors is an integer number (38542766929591).

Almost surely, 2^{77085533859181} is an apocalyptic number.

It is an amenable number.

77085533859181 is a deficient number, since it is larger than the sum of its proper divisors (1).

77085533859181 is an equidigital number, since it uses as much as digits as its factorization.

77085533859181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016000, while the sum is 70.

The spelling of 77085533859181 in words is "seventy-seven trillion, eighty-five billion, five hundred thirty-three million, eight hundred fifty-nine thousand, one hundred eighty-one".