77535071710781 has 2 divisors, whose sum is σ = 77535071710782. Its totient is φ = 77535071710780.

The previous prime is 77535071710771. The next prime is 77535071710793. The reversal of 77535071710781 is 18701717053577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76542376322500 + 992695388281 = 8748850^2 + 996341^2 .

It is an emirp because it is prime and its reverse (18701717053577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77535071710781 - 2¹⁴ = 77535071694397 is a prime.

It is a super-2 number, since 2×77535071710781² (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 77535071710781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77535071710741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38767535855390 + 38767535855391.

It is an arithmetic number, because the mean of its divisors is an integer number (38767535855391).

Almost surely, 2^{77535071710781} is an apocalyptic number.

It is an amenable number.

77535071710781 is a deficient number, since it is larger than the sum of its proper divisors (1).

77535071710781 is an equidigital number, since it uses as much as digits as its factorization.

77535071710781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10084200, while the sum is 59.

The spelling of 77535071710781 in words is "seventy-seven trillion, five hundred thirty-five billion, seventy-one million, seven hundred ten thousand, seven hundred eighty-one".