77195604509 has 2 divisors, whose sum is σ = 77195604510. Its totient is φ = 77195604508.

The previous prime is 77195604463. The next prime is 77195604517. The reversal of 77195604509 is 90540659177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77160617284 + 34987225 = 277778^2 + 5915^2 .

It is a cyclic number.

It is not a de Polignac number, because 77195604509 - 2⁸ = 77195604253 is a prime.

It is a super-2 number, since 2×77195604509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77195604569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38597802254 + 38597802255.

It is an arithmetic number, because the mean of its divisors is an integer number (38597802255).

Almost surely, 2^77195604509 is an apocalyptic number.

It is an amenable number.

77195604509 is a deficient number, since it is larger than the sum of its proper divisors (1).

77195604509 is an equidigital number, since it uses as much as digits as its factorization.

77195604509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2381400, while the sum is 53.

The spelling of 77195604509 in words is "seventy-seven billion, one hundred ninety-five million, six hundred four thousand, five hundred nine".