77964179217 has 24 divisors (see below), whose sum is σ = 107861295360. Its totient is φ = 50090201280.

The previous prime is 77964179203. The next prime is 77964179219. The reversal of 77964179217 is 71297146977.

It is a de Polignac number, because none of the positive numbers 2^k-77964179217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77964179219) 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 23 ways as a sum of consecutive naturals, for example, 1336384 + ... + 1393502.

It is an arithmetic number, because the mean of its divisors is an integer number (4494220640).

Almost surely, 2^77964179217 is an apocalyptic number.

It is an amenable number.

77964179217 is a deficient number, since it is larger than the sum of its proper divisors (29897116143).

77964179217 is a wasteful number, since it uses less digits than its factorization.

77964179217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57721 (or 57692 counting only the distinct ones).

The product of its digits is 9335088, while the sum is 60.

It can be divided in two parts, 779641 and 79217, that added together give a palindrome (858858).

The spelling of 77964179217 in words is "seventy-seven billion, nine hundred sixty-four million, one hundred seventy-nine thousand, two hundred seventeen".