77553433697 has 2 divisors, whose sum is σ = 77553433698. Its totient is φ = 77553433696.

The previous prime is 77553433687. The next prime is 77553433717. The reversal of 77553433697 is 79633435577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68245815121 + 9307618576 = 261239^2 + 96476^2 .

It is a cyclic number.

It is not a de Polignac number, because 77553433697 - 2⁴ = 77553433681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77553433667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38776716848 + 38776716849.

It is an arithmetic number, because the mean of its divisors is an integer number (38776716849).

Almost surely, 2^77553433697 is an apocalyptic number.

It is an amenable number.

77553433697 is a deficient number, since it is larger than the sum of its proper divisors (1).

77553433697 is an equidigital number, since it uses as much as digits as its factorization.

77553433697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50009400, while the sum is 59.

The spelling of 77553433697 in words is "seventy-seven billion, five hundred fifty-three million, four hundred thirty-three thousand, six hundred ninety-seven".