77420789273 has 2 divisors, whose sum is σ = 77420789274. Its totient is φ = 77420789272.

The previous prime is 77420789213. The next prime is 77420789291. The reversal of 77420789273 is 37298702477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61668782224 + 15752007049 = 248332^2 + 125507^2 .

It is a cyclic number.

It is not a de Polignac number, because 77420789273 - 2²⁶ = 77353680409 is a prime.

It is a super-2 number, since 2×77420789273² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77420789213) 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, 38710394636 + 38710394637.

It is an arithmetic number, because the mean of its divisors is an integer number (38710394637).

Almost surely, 2^77420789273 is an apocalyptic number.

It is an amenable number.

77420789273 is a deficient number, since it is larger than the sum of its proper divisors (1).

77420789273 is an equidigital number, since it uses as much as digits as its factorization.

77420789273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8297856, while the sum is 56.

The spelling of 77420789273 in words is "seventy-seven billion, four hundred twenty million, seven hundred eighty-nine thousand, two hundred seventy-three".