77778546317 has 8 divisors (see below), whose sum is σ = 78555106200. Its totient is φ = 77002113600.

The previous prime is 77778546283. The next prime is 77778546343. The reversal of 77778546317 is 71364587777.

It can be written as a sum of positive squares in 4 ways, for example, as 297597001 + 77480949316 = 17251^2 + 278354^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 77778546317 - 2¹⁸ = 77778284173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77778546317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77778546817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1626059 + ... + 1673207.

It is an arithmetic number, because the mean of its divisors is an integer number (9819388275).

Almost surely, 2^77778546317 is an apocalyptic number.

It is an amenable number.

77778546317 is a deficient number, since it is larger than the sum of its proper divisors (776559883).

77778546317 is a wasteful number, since it uses less digits than its factorization.

77778546317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63583.

The product of its digits is 48404160, while the sum is 62.

The spelling of 77778546317 in words is "seventy-seven billion, seven hundred seventy-eight million, five hundred forty-six thousand, three hundred seventeen".