687563131251 has 16 divisors (see below), whose sum is σ = 923952572928. Its totient is φ = 454776098400.

The previous prime is 687563131231. The next prime is 687563131259. The reversal of 687563131251 is 152131365786.

It is not a de Polignac number, because 687563131251 - 2⁹ = 687563130739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687563131251.

It is not an unprimeable number, because it can be changed into a prime (687563131259) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1613725 + ... + 1994801.

It is an arithmetic number, because the mean of its divisors is an integer number (57747035808).

Almost surely, 2^687563131251 is an apocalyptic number.

687563131251 is a deficient number, since it is larger than the sum of its proper divisors (236389441677).

687563131251 is a wasteful number, since it uses less digits than its factorization.

687563131251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385802.

The product of its digits is 907200, while the sum is 48.

The spelling of 687563131251 in words is "six hundred eighty-seven billion, five hundred sixty-three million, one hundred thirty-one thousand, two hundred fifty-one".