77979960343985 has 8 divisors (see below), whose sum is σ = 106943945614656. Its totient is φ = 53471972807280.

The previous prime is 77979960343969. The next prime is 77979960344003. The reversal of 77979960343985 is 58934306997977.

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

It is not a de Polignac number, because 77979960343985 - 2⁴ = 77979960343969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77979960343897 and 77979960343906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1113999433451 + ... + 1113999433520.

It is an arithmetic number, because the mean of its divisors is an integer number (13367993201832).

Almost surely, 2^{77979960343985} is an apocalyptic number.

It is an amenable number.

77979960343985 is a deficient number, since it is larger than the sum of its proper divisors (28963985270671).

77979960343985 is a wasteful number, since it uses less digits than its factorization.

77979960343985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2227998866983.

The product of its (nonzero) digits is 19443654720, while the sum is 86.

The spelling of 77979960343985 in words is "seventy-seven trillion, nine hundred seventy-nine billion, nine hundred sixty million, three hundred forty-three thousand, nine hundred eighty-five".