687857363523 has 64 divisors (see below), whose sum is σ = 1118409523200. Its totient is φ = 414366516000.

The previous prime is 687857363509. The next prime is 687857363573. The reversal of 687857363523 is 325363758786.

It is a happy number.

687857363523 is a `hidden beast` number, since 6 + 8 + 7 + 8 + 573 + 6 + 3 + 52 + 3 = 666.

It is not a de Polignac number, because 687857363523 - 2¹⁴ = 687857347139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687857363573) 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 63 ways as a sum of consecutive naturals, for example, 82760538 + ... + 82768848.

It is an arithmetic number, because the mean of its divisors is an integer number (17475148800).

Almost surely, 2^687857363523 is an apocalyptic number.

687857363523 is a deficient number, since it is larger than the sum of its proper divisors (430552159677).

687857363523 is a wasteful number, since it uses less digits than its factorization.

687857363523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981 (or 9975 counting only the distinct ones).

The product of its digits is 152409600, while the sum is 63.

The spelling of 687857363523 in words is "six hundred eighty-seven billion, eight hundred fifty-seven million, three hundred sixty-three thousand, five hundred twenty-three".