77533000781 has 2 divisors, whose sum is σ = 77533000782. Its totient is φ = 77533000780.

The previous prime is 77533000691. The next prime is 77533000793. The reversal of 77533000781 is 18700033577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46541158756 + 30991842025 = 215734^2 + 176045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77533000781 is a prime.

It is a super-2 number, since 2×77533000781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77533008781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38766500390 + 38766500391.

It is an arithmetic number, because the mean of its divisors is an integer number (38766500391).

Almost surely, 2^77533000781 is an apocalyptic number.

It is an amenable number.

77533000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

77533000781 is an equidigital number, since it uses as much as digits as its factorization.

77533000781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 77533000781 in words is "seventy-seven billion, five hundred thirty-three million, seven hundred eighty-one", and thus it is an aban number.