77879777579 has 8 divisors (see below), whose sum is σ = 83014372800. Its totient is φ = 72806674816.

The previous prime is 77879777557. The next prime is 77879777581. The reversal of 77879777579 is 97577797877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77879777579 is a prime.

It is a super-2 number, since 2×77879777579² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77879777519) 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 7 ways as a sum of consecutive naturals, for example, 15370499 + ... + 15375564.

It is an arithmetic number, because the mean of its divisors is an integer number (10376796600).

Almost surely, 2^77879777579 is an apocalyptic number.

77879777579 is a deficient number, since it is larger than the sum of its proper divisors (5134595221).

77879777579 is a wasteful number, since it uses less digits than its factorization.

77879777579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30746229.

The product of its digits is 2668279320, while the sum is 80.

The spelling of 77879777579 in words is "seventy-seven billion, eight hundred seventy-nine million, seven hundred seventy-seven thousand, five hundred seventy-nine".