77964868961 has 4 divisors (see below), whose sum is σ = 89102707392. Its totient is φ = 66827030532.

The previous prime is 77964868897. The next prime is 77964868973. The reversal of 77964868961 is 16986846977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16986846977 = 53527 ⋅317351.

It is a cyclic number.

It is not a de Polignac number, because 77964868961 - 2⁶ = 77964868897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77964868981) 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, 5568919205 + ... + 5568919218.

It is an arithmetic number, because the mean of its divisors is an integer number (22275676848).

Almost surely, 2^77964868961 is an apocalyptic number.

It is an amenable number.

77964868961 is a deficient number, since it is larger than the sum of its proper divisors (11137838431).

77964868961 is a wasteful number, since it uses less digits than its factorization.

77964868961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11137838430.

The product of its digits is 219469824, while the sum is 71.

The spelling of 77964868961 in words is "seventy-seven billion, nine hundred sixty-four million, eight hundred sixty-eight thousand, nine hundred sixty-one".