77611399017577 has 2 divisors, whose sum is σ = 77611399017578. Its totient is φ = 77611399017576.

The previous prime is 77611399017553. The next prime is 77611399017587. The reversal of 77611399017577 is 77571099311677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74818676748841 + 2792722268736 = 8649779^2 + 1671144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77611399017577 is a prime.

It is not a weakly prime, because it can be changed into another prime (77611399017587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38805699508788 + 38805699508789.

It is an arithmetic number, because the mean of its divisors is an integer number (38805699508789).

Almost surely, 2^{77611399017577} is an apocalyptic number.

It is an amenable number.

77611399017577 is a deficient number, since it is larger than the sum of its proper divisors (1).

77611399017577 is an equidigital number, since it uses as much as digits as its factorization.

77611399017577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122523030, while the sum is 70.

The spelling of 77611399017577 in words is "seventy-seven trillion, six hundred eleven billion, three hundred ninety-nine million, seventeen thousand, five hundred seventy-seven".