77553465709 has 2 divisors, whose sum is σ = 77553465710. Its totient is φ = 77553465708.

The previous prime is 77553465697. The next prime is 77553465719. The reversal of 77553465709 is 90756435577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76681917225 + 871548484 = 276915^2 + 29522^2 .

It is a cyclic number.

It is not a de Polignac number, because 77553465709 - 2²⁹ = 77016594797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77553465719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38776732854 + 38776732855.

It is an arithmetic number, because the mean of its divisors is an integer number (38776732855).

Almost surely, 2^77553465709 is an apocalyptic number.

It is an amenable number.

77553465709 is a deficient number, since it is larger than the sum of its proper divisors (1).

77553465709 is an equidigital number, since it uses as much as digits as its factorization.

77553465709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27783000, while the sum is 58.

The spelling of 77553465709 in words is "seventy-seven billion, five hundred fifty-three million, four hundred sixty-five thousand, seven hundred nine".