77983990202077 has 2 divisors, whose sum is σ = 77983990202078. Its totient is φ = 77983990202076.

The previous prime is 77983990202021. The next prime is 77983990202171. The reversal of 77983990202077 is 77020209938977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53131182904996 + 24852807297081 = 7289114^2 + 4985259^2 .

It is an emirp because it is prime and its reverse (77020209938977) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77983990202077 is a prime.

It is a super-2 number, since 2×77983990202077² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77983990201997 and 77983990202015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77983990208077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38991995101038 + 38991995101039.

It is an arithmetic number, because the mean of its divisors is an integer number (38991995101039).

Almost surely, 2^{77983990202077} is an apocalyptic number.

It is an amenable number.

77983990202077 is a deficient number, since it is larger than the sum of its proper divisors (1).

77983990202077 is an equidigital number, since it uses as much as digits as its factorization.

77983990202077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168031584, while the sum is 70.

The spelling of 77983990202077 in words is "seventy-seven trillion, nine hundred eighty-three billion, nine hundred ninety million, two hundred two thousand, seventy-seven".