77230978578889 has 2 divisors, whose sum is σ = 77230978578890. Its totient is φ = 77230978578888.

The previous prime is 77230978578821. The next prime is 77230978578907. The reversal of 77230978578889 is 98887587903277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45593447253264 + 31637531325625 = 6752292^2 + 5624725^2 .

It is an emirp because it is prime and its reverse (98887587903277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77230978578889 - 2³⁵ = 77196618840521 is a prime.

It is not a weakly prime, because it can be changed into another prime (77230978575889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38615489289444 + 38615489289445.

It is an arithmetic number, because the mean of its divisors is an integer number (38615489289445).

Almost surely, 2^{77230978578889} is an apocalyptic number.

It is an amenable number.

77230978578889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77230978578889 is an equidigital number, since it uses as much as digits as its factorization.

77230978578889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23897825280, while the sum is 88.

The spelling of 77230978578889 in words is "seventy-seven trillion, two hundred thirty billion, nine hundred seventy-eight million, five hundred seventy-eight thousand, eight hundred eighty-nine".