77488747009 has 2 divisors, whose sum is σ = 77488747010. Its totient is φ = 77488747008.

The previous prime is 77488747001. The next prime is 77488747087. The reversal of 77488747009 is 90074788477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75572759025 + 1915987984 = 274905^2 + 43772^2 .

It is a cyclic number.

It is not a de Polignac number, because 77488747009 - 2³ = 77488747001 is a prime.

It is not a weakly prime, because it can be changed into another prime (77488747001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38744373504 + 38744373505.

It is an arithmetic number, because the mean of its divisors is an integer number (38744373505).

Almost surely, 2^77488747009 is an apocalyptic number.

It is an amenable number.

77488747009 is a deficient number, since it is larger than the sum of its proper divisors (1).

77488747009 is an equidigital number, since it uses as much as digits as its factorization.

77488747009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22127616, while the sum is 61.

The spelling of 77488747009 in words is "seventy-seven billion, four hundred eighty-eight million, seven hundred forty-seven thousand, nine".