687813160066 has 4 divisors (see below), whose sum is σ = 1031719740102. Its totient is φ = 343906580032.

The previous prime is 687813160057. The next prime is 687813160081. The reversal of 687813160066 is 660061318786.

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

It can be written as a sum of positive squares in only one way, i.e., 625277655025 + 62535505041 = 790745^2 + 250071^2 .

It is a junction number, because it is equal to n+sod(n) for n = 687813159995 and 687813160022.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171953290015 + ... + 171953290018.

Almost surely, 2^687813160066 is an apocalyptic number.

687813160066 is a deficient number, since it is larger than the sum of its proper divisors (343906580036).

687813160066 is a wasteful number, since it uses less digits than its factorization.

687813160066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343906580035.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 687813160066 in words is "six hundred eighty-seven billion, eight hundred thirteen million, one hundred sixty thousand, sixty-six".