77550405077 has 2 divisors, whose sum is σ = 77550405078. Its totient is φ = 77550405076.

The previous prime is 77550405067. The next prime is 77550405083. The reversal of 77550405077 is 77050405577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69775750801 + 7774654276 = 264151^2 + 88174^2 .

It is an emirp because it is prime and its reverse (77050405577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77550405077 - 2¹⁰ = 77550404053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77550405067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38775202538 + 38775202539.

It is an arithmetic number, because the mean of its divisors is an integer number (38775202539).

Almost surely, 2^77550405077 is an apocalyptic number.

It is an amenable number.

77550405077 is a deficient number, since it is larger than the sum of its proper divisors (1).

77550405077 is an equidigital number, since it uses as much as digits as its factorization.

77550405077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200500, while the sum is 47.

The spelling of 77550405077 in words is "seventy-seven billion, five hundred fifty million, four hundred five thousand, seventy-seven".