687515004145 has 4 divisors (see below), whose sum is σ = 825018004980. Its totient is φ = 550012003312.

The previous prime is 687515004131. The next prime is 687515004181. The reversal of 687515004145 is 541400515786.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77555566144 + 609959438001 = 278488^2 + 780999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687515004145 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687515004095 and 687515004104.

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 in 3 ways as a sum of consecutive naturals, for example, 68751500410 + ... + 68751500419.

It is an arithmetic number, because the mean of its divisors is an integer number (206254501245).

Almost surely, 2^687515004145 is an apocalyptic number.

It is an amenable number.

687515004145 is a deficient number, since it is larger than the sum of its proper divisors (137503000835).

687515004145 is a wasteful number, since it uses less digits than its factorization.

687515004145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137503000834.

The product of its (nonzero) digits is 672000, while the sum is 46.

The spelling of 687515004145 in words is "six hundred eighty-seven billion, five hundred fifteen million, four thousand, one hundred forty-five".