6768380661157 has 4 divisors (see below), whose sum is σ = 6768397517260. Its totient is φ = 6768363805056.

The previous prime is 6768380661149. The next prime is 6768380661179. The reversal of 6768380661157 is 7511660838676.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2834152048036 + 3934228613121 = 1683494^2 + 1983489^2 .

It is a cyclic number.

It is not a de Polignac number, because 6768380661157 - 2³ = 6768380661149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6768380667157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7810668 + ... + 8633845.

It is an arithmetic number, because the mean of its divisors is an integer number (1692099379315).

Almost surely, 2^{6768380661157} is an apocalyptic number.

It is an amenable number.

6768380661157 is a deficient number, since it is larger than the sum of its proper divisors (16856103).

6768380661157 is a wasteful number, since it uses less digits than its factorization.

6768380661157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16856102.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 6768380661157 in words is "six trillion, seven hundred sixty-eight billion, three hundred eighty million, six hundred sixty-one thousand, one hundred fifty-seven".