77860278008257 has 8 divisors (see below), whose sum is σ = 79969915574696. Its totient is φ = 75750919690752.

The previous prime is 77860278008209. The next prime is 77860278008281. The reversal of 77860278008257 is 75280087206877.

It can be written as a sum of positive squares in 4 ways, for example, as 47129652930816 + 30730625077441 = 6865104^2 + 5543521^2 .

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-77860278008257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77860278008192 and 77860278008201.

It is not an unprimeable number, because it can be changed into a prime (77860278008957) 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, 69246978 + ... + 70362379.

It is an arithmetic number, because the mean of its divisors is an integer number (9996239446837).

Almost surely, 2^{77860278008257} is an apocalyptic number.

It is an amenable number.

77860278008257 is a deficient number, since it is larger than the sum of its proper divisors (2109637566439).

77860278008257 is a wasteful number, since it uses less digits than its factorization.

77860278008257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139624467.

The product of its (nonzero) digits is 147517440, while the sum is 67.

The spelling of 77860278008257 in words is "seventy-seven trillion, eight hundred sixty billion, two hundred seventy-eight million, eight thousand, two hundred fifty-seven".