65779677979 has 4 divisors (see below), whose sum is σ = 67309437976. Its totient is φ = 64249917984.

The previous prime is 65779677961. The next prime is 65779677983. The reversal of 65779677979 is 97977697756.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65779677979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65779677899 and 65779677908.

It is not an unprimeable number, because it can be changed into a prime (65779677919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764879934 + ... + 764880019.

It is an arithmetic number, because the mean of its divisors is an integer number (16827359494).

Almost surely, 2^65779677979 is an apocalyptic number.

65779677979 is a deficient number, since it is larger than the sum of its proper divisors (1529759997).

65779677979 is a wasteful number, since it uses less digits than its factorization.

65779677979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529759996.

The product of its digits is 2205414540, while the sum is 79.

The spelling of 65779677979 in words is "sixty-five billion, seven hundred seventy-nine million, six hundred seventy-seven thousand, nine hundred seventy-nine".