687168155 has 16 divisors (see below), whose sum is σ = 875978400. Its totient is φ = 516015360.

The previous prime is 687168151. The next prime is 687168179. The reversal of 687168155 is 551861786.

It is a happy number.

It is not a de Polignac number, because 687168155 - 2² = 687168151 is a prime.

It is a super-2 number, since 2×687168155² = 944400146492208050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (687168151) 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 15 ways as a sum of consecutive naturals, for example, 22826 + ... + 43535.

It is an arithmetic number, because the mean of its divisors is an integer number (54748650).

Almost surely, 2^687168155 is an apocalyptic number.

687168155 is a deficient number, since it is larger than the sum of its proper divisors (188810245).

687168155 is a wasteful number, since it uses less digits than its factorization.

687168155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66494.

The product of its digits is 403200, while the sum is 47.

The square root of 687168155 is about 26213.8924046010. The cubic root of 687168155 is about 882.4450575301.

The spelling of 687168155 in words is "six hundred eighty-seven million, one hundred sixty-eight thousand, one hundred fifty-five".