768891611 has 2 divisors, whose sum is σ = 768891612. Its totient is φ = 768891610.

The previous prime is 768891581. The next prime is 768891619. The reversal of 768891611 is 116198867.

It is a strong prime.

It is an emirp because it is prime and its reverse (116198867) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-768891611 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (768891619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384445805 + 384445806.

It is an arithmetic number, because the mean of its divisors is an integer number (384445806).

Almost surely, 2^768891611 is an apocalyptic number.

768891611 is a deficient number, since it is larger than the sum of its proper divisors (1).

768891611 is an equidigital number, since it uses as much as digits as its factorization.

768891611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 768891611 is about 27728.8948752019. The cubic root of 768891611 is about 916.1256458114.

It can be divided in two parts, 7688 and 91611, that added together give a palindrome (99299).

The spelling of 768891611 in words is "seven hundred sixty-eight million, eight hundred ninety-one thousand, six hundred eleven".