687504163681 has 8 divisors (see below), whose sum is σ = 747619790760. Its totient is φ = 629574559488.

The previous prime is 687504163651. The next prime is 687504163699. The reversal of 687504163681 is 186361405786.

It can be written as a sum of positive squares in 4 ways, for example, as 175980250000 + 511523913681 = 419500^2 + 715209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687504163681 - 2⁹ = 687504163169 is a prime.

It is a super-2 number, since 2×687504163681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687504163651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546505066 + ... + 546506323.

It is an arithmetic number, because the mean of its divisors is an integer number (93452473845).

Almost surely, 2^687504163681 is an apocalyptic number.

It is an amenable number.

687504163681 is a deficient number, since it is larger than the sum of its proper divisors (60115627079).

687504163681 is a wasteful number, since it uses less digits than its factorization.

687504163681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093011443.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 687504163681 in words is "six hundred eighty-seven billion, five hundred four million, one hundred sixty-three thousand, six hundred eighty-one".