77623394851369 has 2 divisors, whose sum is σ = 77623394851370. Its totient is φ = 77623394851368.

The previous prime is 77623394851351. The next prime is 77623394851399. The reversal of 77623394851369 is 96315849332677.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42485471175744 + 35137923675625 = 6518088^2 + 5927725^2 .

It is a cyclic number.

It is not a de Polignac number, because 77623394851369 - 2⁵ = 77623394851337 is a prime.

It is a super-2 number, since 2×77623394851369² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77623394851399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38811697425684 + 38811697425685.

It is an arithmetic number, because the mean of its divisors is an integer number (38811697425685).

Almost surely, 2^{77623394851369} is an apocalyptic number.

It is an amenable number.

77623394851369 is a deficient number, since it is larger than the sum of its proper divisors (1).

77623394851369 is an equidigital number, since it uses as much as digits as its factorization.

77623394851369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234517760, while the sum is 73.

The spelling of 77623394851369 in words is "seventy-seven trillion, six hundred twenty-three billion, three hundred ninety-four million, eight hundred fifty-one thousand, three hundred sixty-nine".