77773963889 has 2 divisors, whose sum is σ = 77773963890. Its totient is φ = 77773963888.

The previous prime is 77773963837. The next prime is 77773963903. The reversal of 77773963889 is 98836937777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58652605489 + 19121358400 = 242183^2 + 138280^2 .

It is a cyclic number.

It is not a de Polignac number, because 77773963889 - 2²⁴ = 77757186673 is a prime.

It is not a weakly prime, because it can be changed into another prime (77773963829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38886981944 + 38886981945.

It is an arithmetic number, because the mean of its divisors is an integer number (38886981945).

Almost surely, 2^77773963889 is an apocalyptic number.

It is an amenable number.

77773963889 is a deficient number, since it is larger than the sum of its proper divisors (1).

77773963889 is an equidigital number, since it uses as much as digits as its factorization.

77773963889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672126336, while the sum is 74.

The spelling of 77773963889 in words is "seventy-seven billion, seven hundred seventy-three million, nine hundred sixty-three thousand, eight hundred eighty-nine".