77746064791 has 4 divisors (see below), whose sum is σ = 78020786152. Its totient is φ = 77471343432.

The previous prime is 77746064771. The next prime is 77746064813. The reversal of 77746064791 is 19746064777.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77746064791 - 2¹⁷ = 77745933719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77746064771) 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 in 3 ways as a sum of consecutive naturals, for example, 137360256 + ... + 137360821.

It is an arithmetic number, because the mean of its divisors is an integer number (19505196538).

Almost surely, 2^77746064791 is an apocalyptic number.

77746064791 is a deficient number, since it is larger than the sum of its proper divisors (274721361).

77746064791 is a wasteful number, since it uses less digits than its factorization.

77746064791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274721360.

The product of its (nonzero) digits is 12446784, while the sum is 58.

The spelling of 77746064791 in words is "seventy-seven billion, seven hundred forty-six million, sixty-four thousand, seven hundred ninety-one".