77626656216091 has 2 divisors, whose sum is σ = 77626656216092. Its totient is φ = 77626656216090.

The previous prime is 77626656216079. The next prime is 77626656216107. The reversal of 77626656216091 is 19061265662677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77626656216091 - 2¹⁹ = 77626655691803 is a prime.

It is not a weakly prime, because it can be changed into another prime (77626656216001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38813328108045 + 38813328108046.

It is an arithmetic number, because the mean of its divisors is an integer number (38813328108046).

Almost surely, 2^{77626656216091} is an apocalyptic number.

77626656216091 is a deficient number, since it is larger than the sum of its proper divisors (1).

77626656216091 is an equidigital number, since it uses as much as digits as its factorization.

77626656216091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68584320, while the sum is 64.

The spelling of 77626656216091 in words is "seventy-seven trillion, six hundred twenty-six billion, six hundred fifty-six million, two hundred sixteen thousand, ninety-one".