77121767059609 has 2 divisors, whose sum is σ = 77121767059610. Its totient is φ = 77121767059608.

The previous prime is 77121767059591. The next prime is 77121767059619. The reversal of 77121767059609 is 90695076712177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74256618403984 + 2865148655625 = 8617228^2 + 1692675^2 .

It is a cyclic number.

It is not a de Polignac number, because 77121767059609 - 2⁹ = 77121767059097 is a prime.

It is not a weakly prime, because it can be changed into another prime (77121767059619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38560883529804 + 38560883529805.

It is an arithmetic number, because the mean of its divisors is an integer number (38560883529805).

Almost surely, 2^{77121767059609} is an apocalyptic number.

It is an amenable number.

77121767059609 is a deficient number, since it is larger than the sum of its proper divisors (1).

77121767059609 is an equidigital number, since it uses as much as digits as its factorization.

77121767059609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70013160, while the sum is 67.

The spelling of 77121767059609 in words is "seventy-seven trillion, one hundred twenty-one billion, seven hundred sixty-seven million, fifty-nine thousand, six hundred nine".