687642360122 has 4 divisors (see below), whose sum is σ = 1031463540186. Its totient is φ = 343821180060.

The previous prime is 687642360113. The next prime is 687642360143. The reversal of 687642360122 is 221063246786.

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., 555741921361 + 131900438761 = 745481^2 + 363181^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171910590029 + ... + 171910590032.

Almost surely, 2^687642360122 is an apocalyptic number.

687642360122 is a deficient number, since it is larger than the sum of its proper divisors (343821180064).

687642360122 is a wasteful number, since it uses less digits than its factorization.

687642360122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343821180063.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 687642360122 in words is "six hundred eighty-seven billion, six hundred forty-two million, three hundred sixty thousand, one hundred twenty-two".