768666091 has 4 divisors (see below), whose sum is σ = 770727232. Its totient is φ = 766604952.

The previous prime is 768666079. The next prime is 768666137. The reversal of 768666091 is 190666867.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768666091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768666001) 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, 1030011 + ... + 1030756.

It is an arithmetic number, because the mean of its divisors is an integer number (192681808).

Almost surely, 2^768666091 is an apocalyptic number.

768666091 is a deficient number, since it is larger than the sum of its proper divisors (2061141).

768666091 is a wasteful number, since it uses less digits than its factorization.

768666091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061140.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 768666091 is about 27724.8280607834. The cubic root of 768666091 is about 916.0360688778.

The spelling of 768666091 in words is "seven hundred sixty-eight million, six hundred sixty-six thousand, ninety-one".