771678638593 has 4 divisors (see below), whose sum is σ = 789624653488. Its totient is φ = 753732623700.

The previous prime is 771678638561. The next prime is 771678638597. The reversal of 771678638593 is 395836876177.

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.

It is a cyclic number.

It is not a de Polignac number, because 771678638593 - 2⁵ = 771678638561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (771678638597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8973007383 + ... + 8973007468.

It is an arithmetic number, because the mean of its divisors is an integer number (197406163372).

Almost surely, 2^771678638593 is an apocalyptic number.

It is an amenable number.

771678638593 is a deficient number, since it is larger than the sum of its proper divisors (17946014895).

771678638593 is a wasteful number, since it uses less digits than its factorization.

771678638593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17946014894.

The product of its digits is 320060160, while the sum is 70.

The spelling of 771678638593 in words is "seven hundred seventy-one billion, six hundred seventy-eight million, six hundred thirty-eight thousand, five hundred ninety-three".