768161857 has 4 divisors (see below), whose sum is σ = 768222640. Its totient is φ = 768101076.

The previous prime is 768161819. The next prime is 768161893. The reversal of 768161857 is 758161867.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 768161857 - 2⁷ = 768161729 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 768161857.

It is not an unprimeable number, because it can be changed into a prime (768161957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3507 + ... + 39352.

It is an arithmetic number, because the mean of its divisors is an integer number (192055660).

Almost surely, 2^768161857 is an apocalyptic number.

It is an amenable number.

768161857 is a deficient number, since it is larger than the sum of its proper divisors (60783).

768161857 is a wasteful number, since it uses less digits than its factorization.

768161857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60782.

The product of its digits is 564480, while the sum is 49.

The square root of 768161857 is about 27715.7330229601. The cubic root of 768161857 is about 915.8357228617.

The spelling of 768161857 in words is "seven hundred sixty-eight million, one hundred sixty-one thousand, eight hundred fifty-seven".