634864678766 has 4 divisors (see below), whose sum is σ = 952297018152. Its totient is φ = 317432339382.

The previous prime is 634864678711. The next prime is 634864678813. The reversal of 634864678766 is 667876468436.

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

It is a self number, because there is not a number n which added to its sum of digits gives 634864678766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158716169690 + ... + 158716169693.

It is an arithmetic number, because the mean of its divisors is an integer number (238074254538).

Almost surely, 2^634864678766 is an apocalyptic number.

634864678766 is a deficient number, since it is larger than the sum of its proper divisors (317432339386).

634864678766 is a wasteful number, since it uses less digits than its factorization.

634864678766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317432339385.

The product of its digits is 1170505728, while the sum is 71.

The spelling of 634864678766 in words is "six hundred thirty-four billion, eight hundred sixty-four million, six hundred seventy-eight thousand, seven hundred sixty-six".